Let’s solve each addition problem step by step. Remember, we’re adding two-digit numbers and sometimes we need to “carry” a number when the ones add up to 10 or more.
We’ll go row by row:
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First Row:
1.
91 + 62
Ones: 1 + 2 = 3
Tens: 9 + 6 = 15 → write down 5, carry over 1? Wait — actually, since it’s tens place, 90 + 60 = 150, plus 3 = 153.
✔ Answer: 153
2.
21 + 52
Ones: 1 + 2 = 3
Tens: 2 + 5 = 7 → 70 + 3 = 73
✔ Answer: 73
3.
12 + 31
Ones: 2 + 1 = 3
Tens: 1 + 3 = 4 → 40 + 3 = 43
✔ Answer: 43
4.
31 + 59
Ones: 1 + 9 = 10 → write 0, carry 1 to tens
Tens: 3 + 5 = 8, plus carried 1 = 9 → 90 + 0 = 90
✔ Answer: 90
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Second Row:
5.
53 + 91
Ones: 3 + 1 = 4
Tens: 5 + 9 = 14 → 140 + 4 = 144
✔ Answer: 144
6.
82 + 16
Ones: 2 + 6 = 8
Tens: 8 + 1 = 9 → 90 + 8 = 98
✔ Answer: 98
7.
48 + 73
Ones: 8 + 3 = 11 → write 1, carry 1
Tens: 4 + 7 = 11, plus carried 1 = 12 → 120 + 1 = 121
✔ Answer: 121
8.
42 + 48
Ones: 2 + 8 = 10 → write 0, carry 1
Tens: 4 + 4 = 8, plus carried 1 = 9 → 90 + 0 = 90
✔ Answer: 90
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Third Row:
9.
25 + 69
Ones: 5 + 9 = 14 → write 4, carry 1
Tens: 2 + 6 = 8, plus carried 1 = 9 → 90 + 4 = 94
✔ Answer: 94
10.
23 + 12
Ones: 3 + 2 = 5
Tens: 2 + 1 = 3 → 30 + 5 = 35
✔ Answer: 35
11.
27 + 48
Ones: 7 + 8 = 15 → write 5, carry 1
Tens: 2 + 4 = 6, plus carried 1 = 7 → 70 + 5 = 75
✔ Answer: 75
12.
64 + 27
Ones: 4 + 7 = 11 → write 1, carry 1
Tens: 6 + 2 = 8, plus carried 1 = 9 → 90 + 1 = 91
✔ Answer: 91
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Fourth Row:
13.
55 + 28
Ones: 5 + 8 = 13 → write 3, carry 1
Tens: 5 + 2 = 7, plus carried 1 = 8 → 80 + 3 = 83
✔ Answer: 83
14.
17 + 22
Ones: 7 + 2 = 9
Tens: 1 + 2 = 3 → 30 + 9 = 39
✔ Answer: 39
15.
36 + 68
Ones: 6 + 8 = 14 → write 4, carry 1
Tens: 3 + 6 = 9, plus carried 1 = 10 → 100 + 4 = 104
✔ Answer: 104
16.
48 + 51
Ones: 8 + 1 = 9
Tens: 4 + 5 = 9 → 90 + 9 = 99
✔ Answer: 99
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Final Answer:
153, 73, 43, 90, 144, 98, 121, 90, 94, 35, 75, 91, 83, 39, 104, 99
Parent Tip: Review the logic above to help your child master the concept of addition worksheet for grade 1 without carryover.
