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Subtraction Within 100

Grade 2 · Building confidence · 14 questions · Version PG-12F780Y-1N26

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1.89 - 10 =
2.39 - 18 =
3.78 - 62 =
4.95 - 44 =
5.42 - 9 =
6.97 - 55 =
7.13 - 3 =
8.49 - 39 =
9.21 - 1 =
10.96 - 74 =
11.77 - 39 =
12.70 - 2 =
13.64 - 12 =
14.15 - 1 =

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 10
  1. 89 - 10 =79
  2. 39 - 18 =21
  3. 78 - 62 =16
  4. 95 - 44 =51
  5. 42 - 9 =33
  6. 97 - 55 =42
  7. 13 - 3 =10
  8. 49 - 39 =10
  9. 21 - 1 =20
  10. 96 - 74 =22
  11. 77 - 39 =38
  12. 70 - 2 =68
  13. 64 - 12 =52
  14. 15 - 1 =14

Worked example

73 - 28 = 45. Regroup 7 tens 3 ones as 6 tens 13 ones.

Common mistake

Subtracting the smaller digit from the larger digit in each column regardless of order.

Helpful hint

Line up place values before subtracting.