2-digit subtraction problems
Thirty two-digit subtractions, plenty of them with borrowing, which is where most people slow down.
30 problems · answer key ·
Problems
Name: ________________ Time: ________
- 75 − 25 =
- 35 − 23 =
- 80 − 48 =
- 78 − 50 =
- 92 − 71 =
- 64 − 49 =
- 83 − 64 =
- 76 − 62 =
- 32 − 14 =
- 91 − 75 =
- 46 − 19 =
- 57 − 33 =
- 42 − 31 =
- 45 − 15 =
- 31 − 17 =
- 89 − 47 =
- 64 − 43 =
- 80 − 11 =
- 53 − 27 =
- 73 − 25 =
- 98 − 77 =
- 35 − 17 =
- 39 − 27 =
- 96 − 18 =
- 62 − 40 =
- 42 − 28 =
- 77 − 46 =
- 36 − 21 =
- 59 − 42 =
- 89 − 42 =
How to do them fast
Skip borrowing: count up from the smaller number to the bigger one, the way you'd count out change.
83 − 47 = 36
47 → 50 is 3 → 50 → 83 is 33 → 3 + 33 = 36
Taking away a number ending in 9? Take away the next ten and give one back.
72 − 29 = 43
72 − 30 = 42 → 42 + 1 = 43
Under 2 seconds each is quick; most people start nearer 4. More methods are in the mental math tricks.
Answer key
- 75 − 25 = 50
- 35 − 23 = 12
- 80 − 48 = 32
- 78 − 50 = 28
- 92 − 71 = 21
- 64 − 49 = 15
- 83 − 64 = 19
- 76 − 62 = 14
- 32 − 14 = 18
- 91 − 75 = 16
- 46 − 19 = 27
- 57 − 33 = 24
- 42 − 31 = 11
- 45 − 15 = 30
- 31 − 17 = 14
- 89 − 47 = 42
- 64 − 43 = 21
- 80 − 11 = 69
- 53 − 27 = 26
- 73 − 25 = 48
- 98 − 77 = 21
- 35 − 17 = 18
- 39 − 27 = 12
- 96 − 18 = 78
- 62 − 40 = 22
- 42 − 28 = 14
- 77 − 46 = 31
- 36 − 21 = 15
- 59 − 42 = 17
- 89 − 42 = 47