Double-Digit Addition Practice Worksheet for Kids

Let’s solve each addition problem step by step. We’ll add the two numbers in each row carefully, starting from the ones place and moving to the tens place. If the sum of the ones is 10 or more, we carry over to the tens.

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Problem ①: 45 + 98

Ones: 5 + 8 = 13 → write down 3, carry 1
Tens: 4 + 9 = 13, plus carried 1 = 14
→ 143

Problem ②: 12 + 33

Ones: 2 + 3 = 5
Tens: 1 + 3 = 4
→ 45

Problem ③: 52 + 28

Ones: 2 + 8 = 10 → write down 0, carry 1
Tens: 5 + 2 = 7, plus carried 1 = 8
→ 80

Problem ④: 19 + 66

Ones: 9 + 6 = 15 → write down 5, carry 1
Tens: 1 + 6 = 7, plus carried 1 = 8
→ 85

Problem ⑤: 47 + 39

Ones: 7 + 9 = 16 → write down 6, carry 1
Tens: 4 + 3 = 7, plus carried 1 = 8
→ 86

Problem ⑥: 91 + 78

Ones: 1 + 8 = 9
Tens: 9 + 7 = 16
→ 169

Problem ⑦: 21 + 89

Ones: 1 + 9 = 10 → write down 0, carry 1
Tens: 2 + 8 = 10, plus carried 1 = 11
→ 110

Problem ⑧: 15 + 55

Ones: 5 + 5 = 10 → write down 0, carry 1
Tens: 1 + 5 = 6, plus carried 1 = 7
→ 70

Problem ⑨: 67 + 23

Ones: 7 + 3 = 10 → write down 0, carry 1
Tens: 6 + 2 = 8, plus carried 1 = 9
→ 90

Problem ⑩: 27 + 21

Ones: 7 + 1 = 8
Tens: 2 + 2 = 4
→ 48

Problem ⑪: 55 + 79

Ones: 5 + 9 = 14 → write down 4, carry 1
Tens: 5 + 7 = 12, plus carried 1 = 13
→ 134

Problem ⑫: 84 + 14

Ones: 4 + 4 = 8
Tens: 8 + 1 = 9
→ 98

Problem ⑬: 46 + 46

Ones: 6 + 6 = 12 → write down 2, carry 1
Tens: 4 + 4 = 8, plus carried 1 = 9
→ 92

Problem ⑭: 93 + 95

Ones: 3 + 5 = 8
Tens: 9 + 9 = 18
→ 188

Problem ⑮: 88 + 55

Ones: 8 + 5 = 13 → write down 3, carry 1
Tens: 8 + 5 = 13, plus carried 1 = 14
→ 143

Problem ⑯: 22 + 47

Ones: 2 + 7 = 9
Tens: 2 + 4 = 6
→ 69

Problem ⑰: 47 + 13

Ones: 7 + 3 = 10 → write down 0, carry 1
Tens: 4 + 1 = 5, plus carried 1 = 6
→ 60

Problem ⑱: 52 + 36

Ones: 2 + 6 = 8
Tens: 5 + 3 = 8
→ 88

Problem ⑲: 87 + 31

Ones: 7 + 1 = 8
Tens: 8 + 3 = 11
→ 118

Problem ⑳: 76 + 39

Ones: 6 + 9 = 15 → write down 5, carry 1
Tens: 7 + 3 = 10, plus carried 1 = 11
→ 115

Problem ㉑: 37 + 67

Ones: 7 + 7 = 14 → write down 4, carry 1
Tens: 3 + 6 = 9, plus carried 1 = 10
→ 104

Problem ㉒: 19 + 29

Ones: 9 + 9 = 18 → write down 8, carry 1
Tens: 1 + 2 = 3, plus carried 1 = 4
→ 48

Problem ㉓: 41 + 51

Ones: 1 + 1 = 2
Tens: 4 + 5 = 9
→ 92

Problem ㉔: 74 + 38

Ones: 4 + 8 = 12 → write down 2, carry 1
Tens: 7 + 3 = 10, plus carried 1 = 11
→ 112

Problem ㉕: 58 + 95

Ones: 8 + 5 = 13 → write down 3, carry 1
Tens: 5 + 9 = 14, plus carried 1 = 15
→ 153

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Final Answer:
① 143
② 45
③ 80
④ 85
⑤ 86
⑥ 169
⑦ 110
⑧ 70
⑨ 90
⑩ 48
⑪ 134
⑫ 98
⑬ 92
⑭ 188
⑮ 143
⑯ 69
⑰ 60
⑱ 88
⑲ 118
⑳ 115
㉑ 104
㉒ 48
㉓ 92
㉔ 112
㉕ 153