Practice Packet Printable K–5 math

Common Core 1.OA.C.6

Addition within 20

Add the ones. If they make ten or more, trade ten ones for one ten and count what is left. The whole sum on this page stays at or under 20.

One worked example

8 + 7

  1. 8 + 2 makes 10.
  2. 7 is 2 + 5, so 5 are still left.
  3. 10 + 5 = 15.

Answer: 15

Add within 20, using a make-ten strategy when it helps.

Easy

Add. The sum is 20 or less.

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1.

2 + 3

2.

9 + 1

3.

1 + 1

4.

10 + 1

5.

1 + 4

6.

2 + 8

Answer key
  1. 5
  2. 10
  3. 2
  4. 11
  5. 5
  6. 10

Medium

Add. The sum is 20 or less.

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1.

4 + 8

2.

14 + 4

3.

2 + 18

4.

9 + 5

5.

2 + 8

6.

10 + 2

7.

10 + 6

8.

4 + 11

9.

11 + 4

Answer key
  1. 12
  2. 18
  3. 20
  4. 14
  5. 10
  6. 12
  7. 16
  8. 15
  9. 15

Hard

Add. The sum is 20 or less.

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1.

8 + 4

2.

2 + 4

3.

6 + 13

4.

2 + 8

5.

11 + 2

6.

7 + 2

7.

11 + 3

8.

5 + 5

9.

12 + 3

10.

5 + 9

11.

12 + 7

12.

6 + 14

Answer key
  1. 12
  2. 6
  3. 19
  4. 10
  5. 13
  6. 9
  7. 14
  8. 10
  9. 15
  10. 14
  11. 19
  12. 20

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