MIA · Mixed set · Unit 3

1. 1.

   Malik has 2 red marbles and 8 blue marbles. Write the ratio of red to blue in simplest form.

   Answer. 1 : 4

   Red : blue = 2 : 8 = 1 : 4.

2. 2.

   Are the ratios 2 : 9 and 4 : 18 equivalent?

   Answer. yes

   Both simplify to 2 : 9, so they are equivalent.

3. 3.

   In Nora’s class, 2 students walk and 3 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form?

   Answer. 2 : 5

   Walkers : class = 2 : 5 = 2 : 5.

4. 4.

   Theo has 6 red marbles and 3 blue marbles. Write the ratio of red to blue in simplest form.

   Answer. 2 : 1

   Red : blue = 6 : 3 = 2 : 1.

5. 5.

   Are the ratios 4 : 8 and 20 : 40 equivalent? Write a complete answer — Priya will compare with a partner.

   Answer. yes

   Both simplify to 1 : 2, so they are equivalent.

6. 6.

   In Nora’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 — Owen will compare with a partner.

   Answer. 3 : 7

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

7. 7.

   Jonah has 7 red marbles and 7 blue marbles. Write the ratio of red to blue in simplest form. Write a complete answer — Nora will compare with a partner.

   Answer. 1 : 1

   Red : blue = 7 : 7 = 1 : 1.

8. 8.

   Complete the equivalent ratio: 7 : 9 = 35 : ? Then Elena needs 2 of that amount. What is the total they need?

   A	B
   7	9
   35	?

   Answer. 90

   Multiply both parts by 5: 9 × 5 = 45. Then multiply by 2: 90.

9. 9.

   In Owen’s class, 4 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. 2 : 5

   Walkers : class = 4 : 10 = 2 : 5.

10. 10.

    Owen has 4 red marbles and 3 blue marbles. Write the ratio of red to blue in simplest form. Write a complete answer — Luis will compare with a partner.

    Answer. 4 : 3

    Red : blue = 4 : 3 = 4 : 3.

11. 11.

    Think

    Priya tried this problem:
    Complete the equivalent ratio: 6 : 9 = 18 : ?
    Priya wrote 54. That is not correct. What is the right answer?

    A	B
    6	9
    18	?

    Answer. 27

    Priya’s answer 54 is off. Multiply both parts by 3: 9 × 3 = 27.

12. 12.

    Think

    Grace tried this problem:
    In Owen’s class, 4 students walk and 7 students bike. What is the part-to-whole ratio of walkers to the class, in simplest form?
    Grace wrote 8 : 11. That is not correct. What is the right answer?

    Answer. 4 : 11

    Grace’s answer 8 : 11 is off. Walkers : class = 4 : 11 = 4 : 11.

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