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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 331 · 40 questions
TalentJR

The fast method (Shift both): How much makes the second number round? 68 needs 2 to make 70. Add that amount to BOTH numbers. Take away the round number.

NameDateTime takenScore ___ / 40
  1. 1.230 − 86 =
  2. 2.475 − 98 =
  3. 3.358 − 19 =
  4. 4.550 − 16 =
  5. 5.202 − 59 =
  6. 6.470 − 17 =
  7. 7.193 − 86 =
  8. 8.458 − 79 =
  9. 9.460 − 48 =
  10. 10.213 − 78 =
  11. 11.138 − 27 =
  12. 12.370 − 17 =
  13. 13.195 − 86 =
  14. 14.514 − 57 =
  15. 15.251 − 37 =
  16. 16.202 − 16 =
  17. 17.208 − 49 =
  18. 18.378 − 57 =
  19. 19.501 − 99 =
  20. 20.160 − 77 =
  21. 21.525 − 78 =
  22. 22.471 − 56 =
  23. 23.566 − 36 =
  24. 24.283 − 26 =
  25. 25.546 − 69 =
  26. 26.85 − 27 =
  27. 27.407 − 16 =
  28. 28.197 − 79 =
  29. 29.331 − 68 =
  30. 30.269 − 98 =
  31. 31.317 − 78 =
  32. 32.571 − 76 =
  33. 33.284 − 46 =
  34. 34.85 − 79 =
  35. 35.204 − 46 =
  36. 36.62 − 17 =
  37. 37.243 − 46 =
  38. 38.252 − 96 =
  39. 39.201 − 39 =
  40. 40.339 − 96 =

Answer key

  1. 144
  2. 377
  3. 339
  4. 534
  5. 143
  6. 453
  7. 107
  8. 379
  9. 412
  10. 135
  11. 111
  12. 353
  13. 109
  14. 457
  15. 214
  16. 186
  17. 159
  18. 321
  19. 402
  20. 83
  21. 447
  22. 415
  23. 530
  24. 257
  25. 477
  26. 58
  27. 391
  28. 118
  29. 263
  30. 171
  31. 239
  32. 495
  33. 238
  34. 6
  35. 158
  36. 45
  37. 197
  38. 156
  39. 162
  40. 243

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