First Grade Subtraction Worksheets

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Grade 1 · 40 problems · differences within 20; related subtraction facts within 20 · includes answer key · CCSS.1.OA.C.6

Subtraction within 20 has 10 facts that start at 10 or less and 10 that start from 11 to 20. Related subtraction facts shows an addition fact first, then asks for the subtraction that matches it. A child who already knows 3 + 9 can use that fact instead of counting back from the total. On 15 - 6, counting back should start at the next number down, not at 15 again. Counting 15 as the first step makes the difference one too big. On the related sheet, some children subtract the two smaller numbers and ignore the total. Point at the total and ask what is being taken away. If counting back falls apart, have them count up from the smaller number instead.

Subtraction within 20

Grade 1 · 20 problems · differences within 20 · includes answer key · CCSS.1.OA.C.6

Subtract.

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1.
15 - 6 = ____
2.
14 - 12 = ____
3.
11 - 1 = ____
4.
16 - 15 = ____
5.
20 - 17 = ____
6.
20 - 4 = ____
7.
12 - 4 = ____
8.
11 - 5 = ____
9.
17 - 7 = ____
10.
18 - 3 = ____
11.
9 - 0 = ____
12.
6 - 3 = ____
13.
2 - 2 = ____
14.
4 - 4 = ____
15.
4 - 1 = ____
16.
2 - 0 = ____
17.
8 - 2 = ____
18.
3 - 1 = ____
19.
7 - 1 = ____
20.
1 - 0 = ____

Answer key

1. 9
2. 2
3. 10
4. 1
5. 3
6. 16
7. 8
8. 6
9. 10
10. 15
11. 9
12. 3
13. 0
14. 0
15. 3
16. 2
17. 6
18. 2
19. 6
20. 1

Related subtraction facts

Grade 1 · 20 problems · related subtraction facts within 20 · includes answer key · CCSS.1.OA.C.6

Use the addition fact to subtract.

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1.
3 + 9 = 12. So 12 - 3 = ____
2.
6 + 7 = 13. So 13 - 6 = ____
3.
2 + 9 = 11. So 11 - 2 = ____
4.
9 + 8 = 17. So 17 - 9 = ____
5.
7 + 9 = 16. So 16 - 7 = ____
6.
4 + 9 = 13. So 13 - 4 = ____
7.
8 + 7 = 15. So 15 - 8 = ____
8.
8 + 6 = 14. So 14 - 8 = ____
9.
7 + 6 = 13. So 13 - 7 = ____
10.
9 + 9 = 18. So 18 - 9 = ____
11.
2 + 8 = 10. So 10 - 2 = ____
12.
1 + 9 = 10. So 10 - 1 = ____
13.
6 + 4 = 10. So 10 - 6 = ____
14.
6 + 3 = 9. So 9 - 6 = ____
15.
7 + 1 = 8. So 8 - 7 = ____
16.
7 + 3 = 10. So 10 - 7 = ____
17.
3 + 2 = 5. So 5 - 3 = ____
18.
2 + 4 = 6. So 6 - 2 = ____
19.
2 + 6 = 8. So 8 - 2 = ____
20.
4 + 4 = 8. So 8 - 4 = ____

Answer key

1. 9
2. 7
3. 9
4. 8
5. 9
6. 9
7. 7
8. 6
9. 6
10. 9
11. 8
12. 9
13. 4
14. 3
15. 1
16. 3
17. 2
18. 4
19. 6
20. 4

Related sheets

These sheets belong to the math worksheet for first graders library.