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Grade 8 · Math

Grade 8 Math: Ratios and proportions · Equivalent ratios

Ontario curriculum: Mathematics (2020) · Number B2.8 — compare proportional situations and determine unknown values

1.

If 16:2 = 192:x, what is x?

2.

If 17:24 = 34:x, what is x?

3.

If 15:9 = 135:x, what is x?

4.

If 2:21 = 16:x, what is x?

5.

If 7:9 = 77:x, what is x?

6.

If 12:15 = 36:x, what is x?

7.

If 3:10 = 15:x, what is x?

8.

If 6:21 = 48:x, what is x?

9.

If 3:16 = 15:x, what is x?

10.

If 9:17 = 45:x, what is x?

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Answer key

Grade 8 Math: Ratios and proportions · Equivalent ratios

Ontario curriculum: Mathematics (2020) · Number B2.8 — compare proportional situations and determine unknown values

Question numbers match the worksheet.

  1. 1.C) 24Both parts are multiplied by 12.
  2. 2.A) 48Both parts are multiplied by 2.
  3. 3.A) 81Both parts are multiplied by 9.
  4. 4.C) 168Both parts are multiplied by 8.
  5. 5.A) 99Both parts are multiplied by 11.
  6. 6.D) 45Both parts are multiplied by 3.
  7. 7.D) 50Both parts are multiplied by 5.
  8. 8.D) 168Both parts are multiplied by 8.
  9. 9.B) 80Both parts are multiplied by 5.
  10. 10.C) 85Both parts are multiplied by 5.

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