L12 · Ratio concepts

1. 1.

   Jonah has 8 red marbles and 7 blue marbles. Write the ratio of red to blue in simplest form.

   Answer. 8 : 7

   Red : blue = 8 : 7 = 8 : 7.

2. 2.

   Priya has 7 red marbles and 3 blue marbles. Write the ratio of red to blue in simplest form.

   Answer. 7 : 3

   Red : blue = 7 : 3 = 7 : 3.

3. 3.

   Nora has 9 red marbles and 5 blue marbles. Write the ratio of red to blue in simplest form.

   Answer. 9 : 5

   Red : blue = 9 : 5 = 9 : 5.

4. 4.

   Jonah 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.

5. 5.

   Priya has 6 red marbles and 6 blue marbles. Write the ratio of red to blue in simplest form. Write a complete answer — Theo will compare with a partner.

   Answer. 1 : 1

   Red : blue = 6 : 6 = 1 : 1.

6. 6.

   Theo has 8 red marbles and 2 blue marbles. Write the ratio of red to blue in simplest form. Write a complete answer — Nora will compare with a partner.

   Answer. 4 : 1

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

7. 7.

   Jonah has 7 red marbles and 8 blue marbles. Write the ratio of red to blue in simplest form. Write a complete answer — Ava will compare with a partner.

   Answer. 7 : 8

   Red : blue = 7 : 8 = 7 : 8.

8. 8.

   Sam has 8 red marbles and 5 blue marbles. Write the ratio of red to blue in simplest form. Write a complete answer — Ava will compare with a partner.

   Answer. 8 : 5

   Red : blue = 8 : 5 = 8 : 5.

9. 9.

   Nora has 3 red marbles and 8 blue marbles. Write the ratio of red to blue in simplest form. Write a complete answer — Owen will compare with a partner.

   Answer. 3 : 8

   Red : blue = 3 : 8 = 3 : 8.

10. 10.

    Malik has 8 red marbles and 2 blue marbles. Write the ratio of red to blue in simplest form. Write a complete answer — Jonah will compare with a partner.

    Answer. 4 : 1

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

11. 11.

    Think

    Priya tried this problem:
    Theo has 6 red marbles and 8 blue marbles. Write the ratio of red to blue in simplest form.
    Priya wrote -3 : 4. That is not correct. What is the right answer?

    Answer. 3 : 4

    Priya’s answer -3 : 4 is off. Red : blue = 6 : 8 = 3 : 4.

12. 12.

    Think

    Luis tried this problem:
    Jonah has 5 red marbles and 4 blue marbles. Write the ratio of red to blue in simplest form.
    Luis wrote 6 : 4. That is not correct. What is the right answer?

    Answer. 5 : 4

    Luis’s answer 6 : 4 is off. Red : blue = 5 : 4 = 5 : 4.

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