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Math Grade K-1 Answer Key

Math: Subtraction Within 20

Practice subtracting numbers up to 20

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Math: Subtraction Within 20

Practice subtracting numbers up to 20

Math - Grade K-1

Instructions: Read each problem carefully. Solve each subtraction problem and show your work if needed.
  1. 1

    Solve: 9 - 3 = __

    Start at 9 and count back 3 numbers.

    9 - 3 = 6. When 3 is taken away from 9, 6 are left.
  2. 2

    Solve: 14 - 5 = __

    14 - 5 = 9. Taking away 5 from 14 leaves 9.
  3. 3

    Solve: 8 - 2 = __

    Use your fingers to take away 2.

    8 - 2 = 6. When 2 are taken away from 8, 6 remain.
  4. 4

    Solve: 17 - 7 = __

    17 - 7 = 10. Taking away 7 from 17 leaves 10.
  5. 5

    There are 12 apples. 4 apples are eaten. How many apples are left?

    Think: 12 - 4.

    There are 8 apples left. Subtracting 4 from 12 gives 8.
  6. 6

    Solve: 15 - 6 = __

    15 - 6 = 9. When 6 are taken away from 15, 9 are left.
  7. 7

    A child has 10 crayons. 3 crayons are lost. How many crayons does the child have now?

    Think: 10 take away 3.

    The child has 7 crayons now. Subtracting 3 from 10 gives 7.
  8. 8

    Solve: 13 - 8 = __

    13 - 8 = 5. Taking away 8 from 13 leaves 5.
  9. 9

    Solve: 20 - 9 = __

    Count back 9 from 20.

    20 - 9 = 11. When 9 are taken away from 20, 11 remain.
  10. 10

    There are 16 birds in a tree. 6 birds fly away. How many birds are still in the tree?

    There are 10 birds still in the tree. Subtracting 6 from 16 gives 10.
  11. 11

    Solve: 11 - 1 = __

    Taking away 1 means the number goes back by 1.

    11 - 1 = 10. Taking away 1 from 11 leaves 10.
  12. 12

    Solve: 18 - 4 = __

    18 - 4 = 14. When 4 are taken away from 18, 14 are left.
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