L14 · Part-to-part and part-to-whole ratios

1. 1.

   In Jonah’s class, 5 students walk and 4 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form?

   Answer. 5 : 9

   Walkers : class = 5 : 9 = 5 : 9.

2. 2.

   In Mei’s class, 2 students walk and 2 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form?

   Answer. 1 : 2

   Walkers : class = 2 : 4 = 1 : 2.

3. 3.

   In Mei’s class, 7 students walk and 3 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form?

   Answer. 7 : 10

   Walkers : class = 7 : 10 = 7 : 10.

4. 4.

   In Sam’s class, 7 students walk and 7 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form?

   Answer. 1 : 2

   Walkers : class = 7 : 14 = 1 : 2.

5. 5.

   In Mei’s class, 3 students walk and 2 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form? Write a complete answer — Sam will compare with a partner.

   Answer. 3 : 5

   Walkers : class = 3 : 5 = 3 : 5.

6. 6.

   In Elena’s class, 3 students walk and 4 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form? Write a complete answer — Nora will compare with a partner.

   Answer. 3 : 7

   Walkers : class = 3 : 7 = 3 : 7.

7. 7.

   In Mei’s class, 7 students walk and 3 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form? Write a complete answer — Mei will compare with a partner.

   Answer. 7 : 10

   Walkers : class = 7 : 10 = 7 : 10.

8. 8.

   In Sam’s class, 8 students walk and 3 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form? Write a complete answer — Jonah will compare with a partner.

   Answer. 8 : 11

   Walkers : class = 8 : 11 = 8 : 11.

9. 9.

   In Owen’s class, 5 students walk and 3 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form? Write a complete answer — Grace will compare with a partner.

   Answer. 5 : 8

   Walkers : class = 5 : 8 = 5 : 8.

10. 10.

    In Elena’s class, 7 students walk and 6 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form? Write a complete answer — Owen will compare with a partner.

    Answer. 7 : 13

    Walkers : class = 7 : 13 = 7 : 13.

11. 11.

    Think

    Jonah tried this problem:
    In Elena’s class, 4 students walk and 6 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form?
    Jonah wrote 1 : 5. That is not correct. What is the right answer?

    Answer. 2 : 5

    Jonah’s answer 1 : 5 is off. Walkers : class = 4 : 10 = 2 : 5.

12. 12.

    Think

    Jonah tried this problem:
    In Grace’s class, 8 students walk and 5 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form?
    Jonah wrote 9 : 13. That is not correct. What is the right answer?

    Answer. 8 : 13

    Jonah’s answer 9 : 13 is off. Walkers : class = 8 : 13 = 8 : 13.

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