Set #4, Item #1

Question: There are 56 birdhouses at school. Today, 4 classes made more birdhourses. Each class made 8 birdhouses. How many total birdhouses are there now?

Answer of 56

//56, the number from the story

Your answer: ” + AnswerForA + ” birdhouses is very close, but not quite correct. Here are two videos showing there are 88, not 56 birdhouses.

Answer of 88

//88

Your answer: ” + AnswerForA + ” birdhouses

Good thinking!! You correctly found that there are 32 new birdhourses and combined it with the first 56 birdhouses. Please check out 2 other ways to solve this question:

This video uses a number line model that is useful in many questions.



This video uses calculations to solve this problem directly.

”

Answer of 32

//distractor A1 is 32

Not quite! Your answer: ” + AnswerForA + ” birdhouses

You may have only found the number of new birdhouses (8 birdhouses made by 4 classes). Watch this video for an explanation about how to get this right next time.

This video uses calculations to solve the problem directly.

Answer of 56

//distractor A2 is 64

Not quite! Your answer: 56 birdhouses

You may have only found the total number of birdhouses after 1 class added 8 birdhouses. However, there are four classes that each add 8 new birdhouses. Watch this video for an explanation about how to get this right next time.

This video uses calculations to solve the problem directly.

Answer of 68

//distractor A3 is 68

Not quite! Your answer: 68 birdhouses

However, there are four classes that each add 8 new birdhouses. Watch this video for an explanation about how to get this right next time.

This video uses calculations to solve the problem directly.

Other Answers

Your answer: _________ birdhouses

There will actually be 88 total birdhouses. There are 32 new birdhourses and combined it with the first 56 birdhouses. Please check out 2 other ways to solve this question:

This video uses a number line model that is useful in many questions.



This video uses calculations to solve this problem directly.

”

Set #4, Item #2

Question: There are 56 birdhouses at school. Today, 4 classes made more birdhourses. Each class made 8 birdhouses. How many total birdhouses are there now?

Answer of 32

//32, the number from the story

Your answer: 32 appears to restate information from the question but does not answer it. Here are two explanations on how to answer the full question next time.

Answer of 6

//6 (or 54 really??)

Your answer: 6 markers

Good thinking!! You correctly found that there are 86 – 32 = 54 markers. Please check out 2 other ways to solve this question:

This video uses subtraction and division to directly calculate the answer.



This video creates a picture that helps consider what these numbers mean.

”

Answer of 5 or 7

//distractor A1 is 5 or 7

Not quite! Your answer: 5 or 7 markers

You may have used an incorrect math fact to divide 54 markers into groups of 9 markers. Watch this video for an details on the correct math fact.



This video creates a picture that helps consider what these numbers mean.

”

Answer of 13 or 14

//distractor A2 is 13 or 14

Not quite! Your answer: 13 or 14 markers

You may have divided 32 markers into groups of 9, but the question asked for the boxes of new numbers. Watch this video for an explanation about how to get this right next time.



This video creates a picture that helps consider what these numbers mean.

”

Answer of 54

//distractor A3 is 54

Not quite! Your answer: 54 birdhouses

However, there are four classes that each add 8 new birdhouses. Watch this video for an explanation about how to get this right next time.

This video uses calculations to solve the problem directly.

Other Answers

Your answer: _____________ appears to restate information from the question but does not answer it. Here are two explanations on how to answer the full question next time.

Set #4, Item #3

Question: Jayson had 274 postcards in his collection. He wanted to give Sam some of his postcards. Jayson gave Sam 8 postcards from each of his collections below: Art, Sports, Schools, Parks, Beaches, Sunsets How many postcards does Jayson have left?

Answer of 274

//274, the number from the story

Your answer: 274 appears to restate information from the question but does not answer it. Here are two explanations on how to answer the full question next time.

Answer of 226

//Key: 226

Your answer: 226 markers

Good thinking!! You correctly found that he gave away 48 postcards, which results in 274 – 48 = 226. Please check out 2 other ways to solve this question:

This video uses multiplication and subtraction to directly calculate the answer.



This video uses subtraction six times.

”

Answer of 34 or 35

//distractor A1 is 34 or 35

Not quite! Your answer: 34 or 35

You may have divided all of Jayson’s postacards among 8 groups. But, the question says Jayson gave Sam 8 postcards from 6 categories. Watch this video for an details on the correct math fact.



This video uses repeated subtraction to solve it.

”

Answer of 258, 266

//distractor A2 is 266, 258

Not quite! Your answer: 258 or 266 markers

You may have subtracted 8 postcards once or twice, but we need to remove six groups of 8 postcards. Watch this video for an explanation about how to get this right next time.



This video uses repeated subtraction to solve it.

”

Answer of 282 and 2192

//distractor A3 is 282, 2192

Not quite! Your answer: ” + AnswerForA + “

You may have used addition or multiplication to solve this question, but we need to subtract 8 postcards six times. Watch this video for an explanation about how to get this right next time.



This video uses repeated subtraction to solve it.

”

Other Answers

Your answer: __________________ is incorrect.

Please take a look at these videos to see how subtraction (and even multiplication) can be used to solve this question.

Set #5, Item #1

Question: Adeline has 8 packs of Fun Gum. Each pack has 7 pieces of gum. Marisol buys Juicy Gum. Each Juicy Gum pack has 9 pieces of gum. Adeline has 11 more pieces of gum than Marisol. How many packs of gum did Marisol buy?

Answer of 35

//35, the number from the story

Your answer: 35 is equal to the value if you add all the numbers. But, it’s important to read closely to understand that addition alone cannot express this problem.

Answer of 5 (correct answer)

//Key: 5

Your answer: 5 packs of gum

Good thinking!! You correctly found that she bought 5 packs of gum. Please check out 2 other ways to solve this question:

This video calculates the answer.



This video includes pictures to help make the work more clear.

”

Answer of 24

//distractor A1 is 24

Your answer: 24 is equal to the value if you add the numbers in the first paragraph. But, it’s important to read closely to understand that addition alone cannot express this problem.

Other Answers

Your answer: __________________ is incorrect.

Please take a look at these videos to see how subtraction (and even multiplication) to solve this question.

Set #5, Question #2

Question: Students in 3 art classes cut 728 inches of ribbon into many 8-inch long pieces. Two classes together cut 656 inches of ribbon. How many 8-inch long pieces of ribbon did the other class cut?

Answer of 9 (correct answer)

//Key: 9

Your answer: 9

Good thinking!! You correctly found that third class cut 9 pieces of ribbon. Please check out 2 other ways to solve this question:

This video calculates the answer.



This video includes pictures to help make the work more clear.

”

Answer of 72

//distractor A1 is 72

Your answer: 72 is equal to the inches of ribbon. But, it’s important to read closely to understand that the ribbon needs to be cut into 9-inch pieces.

This video calculates the answer directly.

This video explains why 72 cannot be the correct answer.

”

Answer of 576

//distractor A2 is 576

Your answer: 576

You may have correctly found the number of inches of riboon, 72, and then mulitplied by 8 rather than divide by 8. Please check out one way to solve this question:

This video calculates the answer.



This video explains why 576 cannot be the correct answer.

”

Other Answers

Your answer: ” + AnswerForA + ” is incorrect.

Please take a look at these videos to see two ways to solve this question so you can do better next time.

Set #5, Item #5

Question: Last summer, Jon’s family found 152 shells at the beach. This summer they were at the beach for 7 days. Each day they found 9 shells. How many fewer shells did they find this year than last year?

Answer of 89 (correct answer)

//Key: 89

Your answer: ” + AnswerForA + ”

Good thinking!! You correctly found that they found 89 fewer shells. Please check out a full explanation about how to solve this question:

This video calculates the answer.

Answer of 80,88,90,98

//distractor A1 is 80, 88, 90, 98

Your answer: 80, 88, 90, or 98 is close but not quite. You may have made a subtraction mistake (if you got 99, you may have forgot to borrow from the ten.

This video calculates the answer directly.

This video explains why answers close to 89 cannot be the correct answer.

”

Answer of 136, 168, 215

//distractor A2 is 136, 168, 215

Your answer: 136, 168, or 215 is close but not quite. You may have added and subtracted but did not consider how each day is repeated addition.

This video calculates the answer directly.

This video explains why answers greater than 100 cannot be the correct answer.

”

Other Answers

Your answer: ____________________ is incorrect.
Please check out a full explanation about how to solve this question:

This video calculates the answer.

Answer of 4 (correct answer)

//redHerring1 is 8,000 or 8000

case “SRL02g”: var vidAddress1 = “”; feedback2 += ” Your answer: _8,000 or 8000_ is not correct because the entire length of the race is 4,800 meters so the tables cannot be spaced 8,000 meters.

This video uses a number line to model the correct situation.

Answer of 400 (correct answer)

Good thinking!! You correctly found that Rob will space the tables 800 meters.

If you are interested, check out 2 other ways to solve this question:

This video uses a model to show why each operation is necessary.



This video uses a number line to model the situation.

Answer of 8

//distractor B1 is 8

Your answer: 8, is not correct. You may have divided incorrectly. Watch this video for an explanation why the distance between tables should be 800 meters, not 8 meters.

Answer of 200

//distractor B2 is 200

Your answer: 200, would be correct for last year’s race, but is not correct for this year’s race. Watch this video for an explanation why 200 meters is not correct and how to adapt the strategy to find the correct answer.

Answer of 2400

//distractor A3 is 2400

Your answer was: 2400, but the actual answer was 800 meters. Watch this video for an explanation why 2,400 meters is not correct and how to adapt the strategy to find the correct answer.

Answer of 4800

//distractor A4 is 4800

Your answer was: 4800, but the actual answer was 800 meters. Watch this video for an explanation why 4,800 meters is not correct and how to adapt the strategy to find the correct answer.

Other Answers including No Answer

Your answer: _______________ was not correct. The actual answer was 800 meters between tables. See how 2 other people solved this question:

This video uses a model to show why each operation is necessary.



This video uses a number line to model the situation.

Set #2, Item #3: Rob bought 27 packs of cups with 12 cups in each pack. There are 6 tables and Rob will put the same number of cups on each table. How many cups will be on each table?

Answer of 48

Your answer: ” + AnswerForA + ” is not correct because the number 48 describes minutes. So, 150 is in minutes, not hours.

If you want to see how 2 other people solved this question, see this video.

Answer of 54 (Correct Answer)

//Key is 54

Good thinking!! You correctly found that there will be 54 cups on each table. (Even though there would be three minutes left after the fourth listen).

If you are interested, check out 2 other ways to solve this question:

This video uses multiplication and division to calculate the number of cups on each table.



This video uses a model of the situation.

Answer of 324

//distractor C1 is 324

Your answer: 324, is the total number of cups, but not the number of cups on each table. This video uses multiplication and division to calculate the number of cups on each table.

Answer of 32

//distractor C2 is 32

Not quite. There are over 300 cups so 32 is too few. This video shows how to correctly model the situation.

Answer of 48

//distractor C3 is 48

Close but there are over 320 cups so 48 is too few. This video shows how to correctly model the situation.

Answer of 52 or 53

//distractor C4 is 52 or 53

You are close, but you probably made a calculation error along the way. This video breaks down each calculation to help diagnose the error.

Other Answers, Including No Answer

Your answer: __________ was not correct. The actual answer is 54 cups on each table. Check out 2 other strategies to solve this question:

This video uses multiplication and division to calculate the number of cups on each table.



This video uses a model of the situation.

Set 3, Item #1

Question: How many total cookies did the students bake? Explain your answer using numbers, words, and/or pictures.

Unclear Answer

Your answer: __________

Your answer is not very clear because it sounds like multiple answers.

If you want to see how to use a table to solve this question, see this video.

“;

Answer of 528 (Correct Answer)

//key is 528

Your answer: 528

Good thinking!! You correctly found there are a total of 528 videos.

If you are interested, check out 2 other other ways to solve this question:

This video uses multiplication and then addition.



This video digs more into .

Answer of 428

//distractor A1 is 428

Not quite! You answered: 428

36 cookies in 8 boxes is 288 cookies and 20 cookies in 12 bags is 240 cookies. When we add 288 and 240, 8 tens plus 4 tens is 12 tens which means we carry an extra hundred.

This video shows why 428 is incorrect and how to get the correct answer.

Other Answers, Including No Answer

Your answer: _________________

But the actual answer was 528 cookies. Watch this video for a detailed solution explanation. It uses multiplication and addition to find the total.



This video explores why multiplication is useful in these questions that ask for the total of groups of objects.

Set 3, Item #2

Question: How many more cookies are in 5 boxes than are in 5 bags?

Correct Answer of 80

//80

Your answer: 80 cookies

Good thinking!! You correctly found that there are 80 cookies more, check out 2 other ways to solve this question:

This video uses the operations to solve the problem directly.



This video uses reasoning to make the problem easier to solve.

Answer of 180

//distractor A1 is 180

Not quite! Your answer: 180 cookies

You may have only found the number of cookies in 5 boxes of 36 cookies, but the question was asking you to compare this value with the cookies in 5 bags. The units must be the same. Watch this video for an explanation of how to find the correct number of cookies.

This video uses the operations to solve the problem directly.

Answer of 100

//distractor A2 is 100

Not quite! Your answer: 100 cookies

You may have only found the number of cookies in 5 bags of 20 cookies, but the question was asking you to compare this value with the cookies in 5 boxes. Watch this video for an explanation of how to find the correct volume of sand.

This video uses the operations to solve the problem directly.

Answer of 280

//distractor A3 is 280

Not quite! Your answer: 280 cookies

You may have found the total number of cookies in 5 boxes and 5 bags, but the question was asking you to compare these values to find how many more. Watch this video for an explanation of how to find the correct volume of sand.

This video uses the operations to solve the problem directly.

Answer of 90

//distractor A4 is 90

Not quite! Your answer: 90 cookies

You may have subtracted incorrectly. Watch this video for an explanation of how to find the correct volume of sand.

This video uses the operations to solve the problem directly.

Other Answers Including No Asnwer

Your answer: ____________ cookies

There will actually be 80 extra cookies.

If you are interested, check out 2 other ways to solve this question:

This video uses the volume equation of rectangular prisms to solve the problem directly.



This video uses reasoning to solve this situation.

Set #3, Question #3

Question: After the bake sale, 1 box and 1 bag of cookies remained. The organizers gave the remaining cookies to the 6 students on the teams. Each student received the same number of cookies. a) What is the largest number of cookies each student could have received? b) How many extra cookies would be left after each student received that number of cookies?

9 cookies with 2 extra cookies (Correct Answer)

//9 cookies for each student with 2 extra cookes (56 div 6 = 9 r 2)

Your answer: 9 cookies for each student, and 2 extra cookies

Good thinking!! You correctly found that there will be 9 cookies for each student with 2 extra cookies.

If you are interested, check out 2 other ways to solve this question:

This video uses division and interpreting the remainder.

“; feedback2 += “

This video using the idea of equally distributing the cookies.

” feedback2 += “

8 cookies for each student

//Each student receives 8, not 9

Your answer: 8 cookies for each student, and _________ extra cookies

Close!! You calculated an incorrect number of cookies per person. Each student will get 9, not 8, cookies as shown in this video.



This video using the idea of equally distributing the cookies.

10 cookies for each student

Your answer: 10 cookies for each student, and __________ extra cookies

Close!! You calculated an incorrect number of cookies per person. Each student will get 9, not 10, cookies as shown in this video.



This video using the idea of equally distributing the cookies.

56 cookies for each student

//Each student receives 56, not 9

Your answer: 56 cookies for each student, and _________ extra cookies

It looks like you found the total number of cookies, 56, but did not share the cookies. Each student will get 9 of these 56 cookies as shown in this video.

” ;

This video using the idea of equally distributing the cookies.

54 cookies for each student

//Each student receives 54, not 9

Your answer: 54 cookies for each student, and ________ extra cookies

Close!! You calculated 54 cookies per person, but we need to divide these cookies as shown in this video.



This video using the idea of equally distributing the cookies.

Correctly shared 9 cookies with each, but had an incorrect remainder

//Student got 9, but not 2 extra

Your answer: 9 cookies for each student, and ______________ extra cookies

Very close! You found that the each student receives 9 cookies, but you did not interpret the remainder of 56 divided by 6 equals 9 remainder 2 correctly.

If you are interested, check out this video digging into this question:

This video uses the volume equation of rectangular prisms to solve the problem directly.



This video using the idea of equally distributing the cookies.

Correctly identified 2 extra cookies but did not share correctly

} else if (AnswerForB == 1) { //Student got 2 extra, but not 9 per student

Your answer: ________ cookies for each student, and 2 extra cookies

Very close! You found that there are 2 extra cookies but did not determine that each student receives 9 cookies. There will actually be 80 extra cookies.

If you are interested, check out 2 other ways to solve this question:

This video uses the volume equation of rectangular prisms to solve the problem directly.



This video using the idea of equally distributing the cookies.

Other Answers

} else if (AnswerForA == null) {

Your answer: ____________ cookies for each student, and _______________ extra cookies

Very close! You found that there are 2 extra cookies but did not determine that each student receives 9 cookies. There will actually be 80 extra cookies.

If you are interested, check out 2 other ways to solve this question:

This video uses the volume equation of rectangular prisms to solve the problem directly.



This video using the idea of equally distributing the cookies.

Answer of 450 (correct answer)

//Key is 450

Your answer: 450 people

Good thinking!! You correctly found that 450 people can run the race this year.

If you are interested, check out 2 other ways to solve this question:

This video uses two common strategies for describing calculations of this kind.



This video uses a number line to model the combinations and determine the correct number of letters.

Unclear Answer

Your answer: (Statement that is was one of two answers (4.5 or 4,500)

Your answer is not very clear because it sounds like multiple answers.

If you want to see how to use a table to solve this question, see this video.

Answer of 150

//distractor A1 is 150

Not quite! You answered: 150 people

It’s critical to think about what the question asks. The question asks for the number of people racing this year, but 150 is the number that raced last year.

This video shows why 150 is incorrect and how to find the correct answer.

Answer of 45

//distractor A2 is 45

Your answer: 45 people

But the actual answer was much greater because it is 150 multiplied by 3. This video shows why 45 is to few, and how to find the correct answer.

Answer of 564

Close! Your answer: 564 people

But, the questions said that 38 students could not race last year, so we should use 188 – 38 as the number of racers last year. This video shows how to catch this mistake and find the correct answer.

Answer of 114

//distractor A4 is 114

Close! Your answer: 114 people

But, the questions said that 38 students could not race last year, so we should use 188 – 38 as the number of racers last year. This video shows how to catch this mistake and find the correct answer.

Other Answers Including No Answer

Your answer: ________

But the actual answer was 450.

Watch this video shows how to use two operations: subtraction and multiplication.



This video uses a number line to model the situation.

Correct Answer: Equation Equivalent to 150 = 48 x 3 + M

Good thinking!! You correctly found an equation using M:” + AnswerForA + “

If you are interested, check out 2 other ways to solve this question:

This video uses a description of the situation to create the equation 150=48×3+M.



This video uses a number line to model the situation and ends with 4 correct equations.

Answer of a Partially Correct Equation

Your answer: (Partially correct equation, like 48 x 3 + M = 2.5, M + 48 x 3 = 2.5)

This equation is not correct because the number 48 describes minutes. So, 150 is in minutes, not hours.

If you want to see how 2 other people solved this question, see this video.

Answer Equivalent to M = 3 x 48

//distractor C1 is M=3×48

Not quite. This variable has a different meaning. Your answer: (equivalent to M = 3 x 48), is not correct because M is equal to an expression like, 150-3×48. Watch this video for an explanation of how to think about M.

Answer Includes M but Incorrect

Not quite. This variable has a different meaning. Your answer: ” + AnswerForA + “, describes the amount of time she listened to music, not the amount of time remaining. Watch this video for a description of how to use the variable M in a correct equation.

Other Incorrect Answers Including No Answer

You did not provide an answer to this question. It’s best to try as hard as you can so we can give you better feedback.

This video uses a description of the situation to create the equation 150=48×3+M.



This video uses a number line to model the situation and ends with 4 correct equations.

Answer of Yes because 2.5 hours is less than 283 minutes (correct answer)

Good thinking!! You correctly found that she does not have enough time.

If you are interested, check out 2 other ways to solve this question:

This video uses a clock to find the number of minutes in two-and-a-half hours, and then adds the lengths of the albums to compare the two amounts.



This video uses a model to quickly compare the lengths of time.

Answer with explanation including 282 minutes

//distractor A1 is 282

Your answer: (Including 282 minutes)

Your answer is essentially correct because Kara does not have enough time. However, watch this video for an explanation why the sum should be 283 minutes, not 282 minutes.

Answer of Yes and No

You answered both ways, but she actually does not have enough time!

Watch this video to see how to find the number of minutes in two-and-a-half hours, and then compare that amount of time to the album lengths.

Answer that is general without mathematical evidence

//distractor A2 is too much, a lot, long

Your answer: (General Answer)

Your answer is ok, but not specific enough to convince someone else your answer is correct. Watch this video for a full, correct explanation.

“;

Answer that says yes without mathematical evidence

Your answer: (Yes but no evidence)

You said that she does have enough time, but she actually does not have enough time. This video shows why she does not have enough time.

Other Answers

Your answer: (Other Answer)



The actual answer was “No, there is not enough time” with a valid explanation.

See how 2 other people solved this question:

This video uses a clock to find the number of minutes in two-and-a-half hours, and then adds the lengths of the albums to compare the two amounts.

“; feedback2 += “

This video uses a model to quickly compare the lengths of time.

Answer of 4 (correct answer)

Your answer: _____4______

Good thinking!! You correctly found that she can listen to the playlist four times. (Even though there would be three minutes left after the fourth listen).

If you are interested, check out 2 other ways to solve this question:

This video uses division to find the number of times the playlist fits in 35 minutes.



This video uses a number line to model the car ride.

Answer of 5

Your answer: ____5______

Your answer is close because she can listen to it four times. She cannot listen to the playlist one more time.

This video uses division to find the number of times the playlist fits in 35 minutes.

This video uses a number line to model the car ride.

Answer of 3

Not quite! You answered: 3

But, it would only take 24 minutes to listen to the playlist 3 times so she would have 11 extra minutes.

This video shows why 3 times is not the correct answer and provides a strategy to use next time.



This video uses calculations to find the correct answer.

Answer of 8

Your answer: 0

But the actual answer was 4 times. She could easily listen 1 time, but the question asked how many times could she listen in a row during 35 minutes. Watch this video for an explanation why it would take 8 minutes to listen to it 1 time, so she could listen 4 total times.



This video uses a number line to model the car ride.

Answer of 1

Your answer: 1

But the actual answer was 4 times. She could easily listen 1 time, but the question asked how many times could she listen in a row during 35 minutes. Watch this video for an explanation why it would take 8 minutes to listen to it 1 time, so she could listen 4 total times.



This video uses a number line to model the car ride.

Other Answers & Did Not Answer

You did not provide an answer to this question.

Watch this video for an explanation why it would take 8 minutes to listen to it 1 time, so she could listen 4 total times.



This video uses a number line to model the car ride.

On a scale from 0 to 100 with 10 being not sure, 40 being somewhat sure, 70 being pretty sure, and 100 being very sure.

 

How sure are you that you solved the second problem?

(The one about Jon’s seashells.)

  

 

0

100

Last summer, Jon’s family found 152 shells at the beach. This summer they were at the beach for 7 days. Each day they found 9 shells.

How many fewer shells did they find this year than last year?