Let’s solve each problem one by one. We’ll do the math carefully, step by step.
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Problem 1: 56 + 46
Add ones: 6 + 6 = 12 → write down 2, carry over 1
Add tens: 5 + 4 = 9, plus carried 1 = 10
Answer:
102
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Problem 2: 60 - 28
Ones: 0 - 8 → can’t do, so borrow from tens.
60 becomes 5 tens and 10 ones.
10 - 8 = 2
Tens: 5 - 2 = 3
Answer:
32
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Problem 3: 81 - 27
Ones: 1 - 7 → can’t do, borrow from tens.
81 becomes 7 tens and 11 ones.
11 - 7 = 4
Tens: 7 - 2 = 5
Answer:
54
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Problem 4: 59 + 16
Ones: 9 + 6 = 15 → write 5, carry 1
Tens: 5 + 1 = 6, plus carried 1 = 7
Answer:
75
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Problem 5: 77 + 24
Ones: 7 + 4 = 11 → write 1, carry 1
Tens: 7 + 2 = 9, plus carried 1 = 10
Answer:
101
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Problem 6: 45 + 16
Ones: 5 + 6 = 11 → write 1, carry 1
Tens: 4 + 1 = 5, plus carried 1 = 6
Answer:
61
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Problem 7: 42 - 37
Ones: 2 - 7 → can’t do, borrow from tens.
42 becomes 3 tens and 12 ones.
12 - 7 = 5
Tens: 3 - 3 = 0
Answer:
5
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Problem 8: 69 + 22
Ones: 9 + 2 = 11 → write 1, carry 1
Tens: 6 + 2 = 8, plus carried 1 = 9
Answer:
91
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Problem 9: 28 - 19
Ones: 8 - 9 → can’t do, borrow from tens.
28 becomes 1 ten and 18 ones.
18 - 9 = 9
Tens: 1 - 1 = 0
Answer:
9
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Problem 10: 99 + 53
Ones: 9 + 3 = 12 → write 2, carry 1
Tens: 9 + 5 = 14, plus carried 1 = 15
Answer:
152
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Problem 11: 28 - 21
Ones: 8 - 1 = 7
Tens: 2 - 2 = 0
Answer:
7
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Problem 12: 78 - 19
Ones: 8 - 9 → can’t do, borrow from tens.
78 becomes 6 tens and 18 ones.
18 - 9 = 9
Tens: 6 - 1 = 5
Answer:
59
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Problem 13: 38 + 38
Ones: 8 + 8 = 16 → write 6, carry 1
Tens: 3 + 3 = 6, plus carried 1 = 7
Answer:
76
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Problem 14: 82 - 68
Ones: 2 - 8 → can’t do, borrow from tens.
82 becomes 7 tens and 12 ones.
12 - 8 = 4
Tens: 7 - 6 = 1
Answer:
14
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Problem 15: 95 - 77
Ones: 5 - 7 → can’t do, borrow from tens.
95 becomes 8 tens and 15 ones.
15 - 7 = 8
Tens: 8 - 7 = 1
Answer:
18
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Problem 16: 98 - 78
Ones: 8 - 8 = 0
Tens: 9 - 7 = 2
Answer:
20
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Problem 17: 68 - 29
Ones: 8 - 9 → can’t do, borrow from tens.
68 becomes 5 tens and 18 ones.
18 - 9 = 9
Tens: 5 - 2 = 3
Answer:
39
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Problem 18: 57 - 18
Ones: 7 - 8 → can’t do, borrow from tens.
57 becomes 4 tens and 17 ones.
17 - 8 = 9
Tens: 4 - 1 = 3
Answer:
39
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Problem 19: 99 + 99
Ones: 9 + 9 = 18 → write 8, carry 1
Tens: 9 + 9 = 18, plus carried 1 = 19
Answer:
198
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Problem 20: 74 + 68
Ones: 4 + 8 = 12 → write 2, carry 1
Tens: 7 + 6 = 13, plus carried 1 = 14
Answer:
142
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Final Answer:
1. 102
2. 32
3. 54
4. 75
5. 101
6. 61
7. 5
8. 91
9. 9
10. 152
11. 7
12. 59
13. 76
14. 14
15. 18
16. 20
17. 39
18. 39
19. 198
20. 142
Parent Tip: Review the logic above to help your child master the concept of adding and subtracting two digit numbers with regrouping worksheet.
