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Mental math worksheet for practicing addition and subtraction skills, ideal for classroom use.

10 Printable Addition Math Worksheets. Adding by 1. Numbers

Educational worksheet: 10 Printable Addition Math Worksheets. Adding by 1. Numbers. Download and print for classroom or home learning activities.

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Show Answer Key & Explanations Step-by-step solution for: 10 Printable Addition Math Worksheets. Adding by 1. Numbers
Let’s solve each problem one by one. We’ll go column by column, left to right, top to bottom.

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First Column (Subtraction):

1. 13 - 7 = 6
2. 21 - 2 = 19
3. 16 - 11 = 5
4. 10 - 7 = 3
5. 15 - 9 = 6
6. 27 - 11 = 16
7. 13 - 8 = 5
8. 21 - 11 = 10
9. 25 - 19 = 6
10. 12 - 7 = 5
11. 23 - 8 = 15
12. 21 - 10 = 11

Double-checked — all correct.

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Second Column (Addition):

1. 12 + 5 = 17
2. 12 + 13 = 25
3. 11 + 9 = 20
4. 3 + 18 = 21
5. 23 + 15 = 38
6. 7 + 15 = 22
7. 31 + 4 = 35
8. 15 + 7 = 22
9. 32 + 7 = 39
10. 13 + 9 = 22
11. 3 + 26 = 29
12. 5 + 19 = 24

All checked — looks good.

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Third Column (Mixed Addition & Subtraction):

1. 13 + 9 = 22
2. 22 - 7 = 15
3. 16 + 8 = 24
4. 15 - 6 = 9
5. 12 + 19 = 31
6. 22 - 5 = 17
7. 23 + 4 = 27
8. 11 - 7 = 4
9. 22 + 9 = 31
10. 22 - 4 = 18
11. 23 + 6 = 29
12. 12 - 8 = 4

Verified — no mistakes.

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Final Answer:
Here are all the answers in order, row by row:

Row 1: 6, 17, 22
Row 2: 19, 25, 15
Row 3: 5, 20, 24
Row 4: 3, 21, 9
Row 5: 6, 38, 31
Row 6: 16, 22, 17
Row 7: 5, 35, 27
Row 8: 10, 22, 4
Row 9: 6, 39, 31
Row 10: 5, 22, 18
Row 11: 15, 29, 29
Row 12: 11, 24, 4
Parent Tip: Review the logic above to help your child master the concept of printable addition and subtraction worksheets.
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