Two-Digit Addition & Subtraction — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 34 + 28 = 62.
Add the ones: 4 + 8 = 12, write 2 and carry 1. Add the tens: 3 + 2 + 1 = 6. So 34 + 28 = 62.
2. 71 − 39 = 32.
Regroup: 11 − 9 = 2 in the ones place, then 6 − 3 = 3 in the tens place. So 71 − 39 = 32.
3. 46 + 35 = 81.
Add the ones: 6 + 5 = 11, write 1 and carry 1. Add the tens: 4 + 3 + 1 = 8. So 46 + 35 = 81.
4. 93 − 57 = 36.
Regroup: 13 − 7 = 6 in the ones place, then 8 − 5 = 3 in the tens place. So 93 − 57 = 36.
5. 37 + 24 = 61.
To find the missing number, subtract: 61 − 24 = 37. Check: 37 + 24 = 61.
6. 85 − 37 = 48.
To find the missing number, subtract: 85 − 48 = 37. Check: 85 − 37 = 48.
7. 27 + 56 = 83.
Add the ones: 7 + 6 = 13, write 3 and carry 1. Add the tens: 2 + 5 + 1 = 8. So 27 + 56 = 83.
8. 60 − 23 = 37.
Regroup: 10 − 3 = 7 in the ones place, then 5 − 2 = 3 in the tens place. So 60 − 23 = 37.
9. 49 + 32 = 81.
Add the ones: 9 + 2 = 11, write 1 and carry 1. Add the tens: 4 + 3 + 1 = 8. So 49 + 32 = 81.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
25 + 47
→ 72
72
83 − 56
→ 27
56
64 + 19
→ 83
83
90 − 34
→ 56
27
25 + 47 = 72 (regroup ones: 5 + 7 = 12). 83 − 56 = 27 (regroup: 13 − 6 = 7, 7 − 5 = 2). 64 + 19 = 83 (regroup ones: 4 + 9 = 13). 90 − 34 = 56 (regroup: 10 − 4 = 6, 8 − 3 = 5).