Two-Digit Addition & Subtraction — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Mia has 43 crayons. She gets 29 more. How many crayons does Mia have now?
A) 62
B) 72
C) 71
D) 82
Add 43 + 29. Ones: 3 + 9 = 12, write 2 and carry 1. Tens: 4 + 2 + 1 = 7. Mia has 72 crayons.
2. A bus had 85 passengers. Then 47 got off. How many passengers are left?
A) 48
B) 42
C) 38
D) 32
Subtract 85 − 47. Regroup: 15 − 7 = 8 in the ones place, then 7 − 4 = 3 in the tens place. 38 passengers are left.
3. Which number sentence shows 6 tens and 14 ones?
A) 60 + 14 = 74
B) 64 + 10 = 74
C) 6 + 14 = 20
D) 61 + 4 = 65
6 tens = 60 and 14 ones = 14. Adding them together: 60 + 14 = 74. This is an example of regrouping 14 ones as 1 ten and 4 ones.
4. Leo had 61 stickers. He gave 24 to his friend and 18 to his sister. How many does he have left?
A) 29
B) 19
C) 23
D) 37
First subtract: 61 − 24 = 37. Then subtract again: 37 − 18 = 19. Leo has 19 stickers left.
Part B: Fill in the Blank
Write the correct answer on each line.
1. 46 + 37 = 83.
Add the ones: 6 + 7 = 13, write 3 and carry 1. Add the tens: 4 + 3 + 1 = 8. So 46 + 37 = 83.
2. 91 − 64 = 27.
Regroup: 11 − 4 = 7 in the ones place, then 8 − 6 = 2 in the tens place. So 91 − 64 = 27.
3. 37 + 45 = 82.
To find the missing number, subtract: 82 − 45 = 37. Check: 37 + 45 = 82.
4. 75 − 38 = 37.
Regroup: 15 − 8 = 7 in the ones place, then 6 − 3 = 3 in the tens place. So 75 − 38 = 37.
5. 28 + 55 = 83.
Add the ones: 8 + 5 = 13, write 3 and carry 1. Add the tens: 2 + 5 + 1 = 8. So 28 + 55 = 83.