Answer of 450 (correct answer)

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

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

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

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

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

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

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.

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.)

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?

Draw a line underneath your scratch work. You can upload a picture of the scratch work at the end.

Go to Next Question