3-digit subtraction problems
Thirty problems taking a two-digit number away from a three-digit one, many of them across a hundred.
30 problems · answer key ·
Problems
Name: ________________ Time: ________
- 278 − 47 =
- 140 − 79 =
- 433 − 90 =
- 308 − 90 =
- 111 − 65 =
- 325 − 66 =
- 201 − 38 =
- 349 − 74 =
- 165 − 72 =
- 350 − 95 =
- 395 − 32 =
- 492 − 81 =
- 392 − 71 =
- 478 − 64 =
- 495 − 66 =
- 299 − 57 =
- 187 − 75 =
- 489 − 74 =
- 138 − 86 =
- 464 − 79 =
- 276 − 98 =
- 454 − 36 =
- 331 − 41 =
- 235 − 81 =
- 445 − 83 =
- 188 − 69 =
- 495 − 79 =
- 435 − 53 =
- 295 − 98 =
- 267 − 78 =
How to do them fast
Take away the tens, then the ones.
412 − 76 = 336
412 − 70 = 342 → 342 − 6 = 336
Or count up, which is easiest when the answer crosses a hundred.
305 − 68 = 237
68 → 100 is 32 → 100 → 305 is 205 → 32 + 205 = 237
Around 3 seconds each is good; under 2 is fast. More methods are in the mental math tricks.
Answer key
- 278 − 47 = 231
- 140 − 79 = 61
- 433 − 90 = 343
- 308 − 90 = 218
- 111 − 65 = 46
- 325 − 66 = 259
- 201 − 38 = 163
- 349 − 74 = 275
- 165 − 72 = 93
- 350 − 95 = 255
- 395 − 32 = 363
- 492 − 81 = 411
- 392 − 71 = 321
- 478 − 64 = 414
- 495 − 66 = 429
- 299 − 57 = 242
- 187 − 75 = 112
- 489 − 74 = 415
- 138 − 86 = 52
- 464 − 79 = 385
- 276 − 98 = 178
- 454 − 36 = 418
- 331 − 41 = 290
- 235 − 81 = 154
- 445 − 83 = 362
- 188 − 69 = 119
- 495 − 79 = 416
- 435 − 53 = 382
- 295 − 98 = 197
- 267 − 78 = 189