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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 239 · 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. 1.581 − 66 =
  2. 2.147 − 97 =
  3. 3.135 − 19 =
  4. 4.257 − 17 =
  5. 5.158 − 77 =
  6. 6.544 − 16 =
  7. 7.231 − 86 =
  8. 8.241 − 66 =
  9. 9.290 − 19 =
  10. 10.165 − 48 =
  11. 11.181 − 37 =
  12. 12.248 − 88 =
  13. 13.590 − 38 =
  14. 14.61 − 16 =
  15. 15.81 − 28 =
  16. 16.438 − 59 =
  17. 17.297 − 29 =
  18. 18.52 − 37 =
  19. 19.193 − 99 =
  20. 20.67 − 17 =
  21. 21.160 − 49 =
  22. 22.371 − 29 =
  23. 23.440 − 27 =
  24. 24.385 − 59 =
  25. 25.466 − 79 =
  26. 26.214 − 59 =
  27. 27.255 − 76 =
  28. 28.418 − 79 =
  29. 29.184 − 28 =
  30. 30.349 − 98 =
  31. 31.396 − 68 =
  32. 32.523 − 27 =
  33. 33.574 − 58 =
  34. 34.153 − 49 =
  35. 35.512 − 76 =
  36. 36.351 − 89 =
  37. 37.375 − 16 =
  38. 38.215 − 28 =
  39. 39.287 − 69 =
  40. 40.545 − 36 =

Answer key

  1. 515
  2. 50
  3. 116
  4. 240
  5. 81
  6. 528
  7. 145
  8. 175
  9. 271
  10. 117
  11. 144
  12. 160
  13. 552
  14. 45
  15. 53
  16. 379
  17. 268
  18. 15
  19. 94
  20. 50
  21. 111
  22. 342
  23. 413
  24. 326
  25. 387
  26. 155
  27. 179
  28. 339
  29. 156
  30. 251
  31. 328
  32. 496
  33. 516
  34. 104
  35. 436
  36. 262
  37. 359
  38. 187
  39. 218
  40. 509

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