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Fractions of a Set

Grade 3 · Building confidence · 12 questions · Version PG-H9W0W9-Q7EQ

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1.What is 2/3 of 21?
2.What is 3/10 of 30?
3.What is 1/5 of 10?
4.What is 7/10 of 20?
5.What is 8/10 of 30?
6.What is 3/5 of 20?
7.What is 2/3 of 9?
8.What is 2/3 of 6?
9.What is 3/5 of 15?
10.What is 1/3 of 12?
11.What is 4/6 of 12?
12.What is 1/3 of 24?

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 18
  1. What is 2/3 of 21?14
  2. What is 3/10 of 30?9
  3. What is 1/5 of 10?2
  4. What is 7/10 of 20?14
  5. What is 8/10 of 30?24
  6. What is 3/5 of 20?12
  7. What is 2/3 of 9?6
  8. What is 2/3 of 6?4
  9. What is 3/5 of 15?9
  10. What is 1/3 of 12?4
  11. What is 4/6 of 12?8
  12. What is 1/3 of 24?8

Worked example

1/3 of 12 is 4 because 12 divided into 3 equal groups gives 4 in each.

Common mistake

Multiplying by the denominator instead of dividing into equal groups.

Helpful hint

Divide by the denominator, then multiply by the numerator.