L30 · Dot plots and histograms

1. 1.

   The dot plot shows hours of sleep. How many students slept 9 hours?

   Answer. 1

   Count the dots above 9: 1.

2. 2.

   The dot plot shows hours of sleep. How many students slept 7 hours?

   Answer. 1

   Count the dots above 7: 1.

3. 3.

   The dot plot shows hours of sleep. How many students slept 8 hours?

   Answer. 4

   Count the dots above 8: 4.

4. 4.

   The dot plot shows hours of sleep. How many students slept 10 hours?

   Answer. 2

   Count the dots above 10: 2.

5. 5.

   The dot plot shows hours of sleep. How many students slept 9 hours? Then Mei needs 4 of that amount. What is the total they need?

   Answer. 8

   Count the dots above 9: 2. Then multiply by 4: 8.

6. 6.

   The dot plot shows hours of sleep. How many students slept 8 hours? Then Jonah needs 2 of that amount. What is the total they need?

   Answer. 4

   Count the dots above 8: 2. Then multiply by 2: 4.

7. 7.

   The dot plot shows hours of sleep. How many students slept 11 hours? Then Theo needs 2 of that amount. What is the total they need?

   Answer. 4

   Count the dots above 11: 2. Then multiply by 2: 4.

8. 8.

   The dot plot shows hours of sleep. How many students slept 8 hours? Then Theo needs 3 of that amount. What is the total they need?

   Answer. 3

   Count the dots above 8: 1. Then multiply by 3: 3.

9. 9.

   The dot plot shows hours of sleep. How many students slept 10 hours? Then Sam needs 5 of that amount. What is the total they need?

   Answer. 5

   Count the dots above 10: 1. Then multiply by 5: 5.

10. 10.

    The dot plot shows hours of sleep. How many students slept 8 hours? Then Ava needs 3 of that amount. What is the total they need?

    Answer. 9

    Count the dots above 8: 3. Then multiply by 3: 9.

11. 11.

    Think

    Theo tried this problem:
    The dot plot shows hours of sleep. How many students slept 8 hours?
    Theo wrote 4. That is not correct. What is the right answer?

    Answer. 2

    Theo’s answer 4 is off. Count the dots above 8: 2.

12. 12.

    Think

    Malik tried this problem:
    The dot plot shows hours of sleep. How many students slept 9 hours?
    Malik wrote 3. That is not correct. What is the right answer?

    Answer. 2

    Malik’s answer 3 is off. Count the dots above 9: 2.

Original extra practice. Keys are computed from the items, not guessed.