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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 802 · 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. 1.120 − 99 =
  2. 2.259 − 86 =
  3. 3.284 − 67 =
  4. 4.100 − 48 =
  5. 5.318 − 59 =
  6. 6.176 − 16 =
  7. 7.90 − 59 =
  8. 8.508 − 17 =
  9. 9.124 − 29 =
  10. 10.124 − 38 =
  11. 11.449 − 49 =
  12. 12.279 − 76 =
  13. 13.455 − 66 =
  14. 14.182 − 77 =
  15. 15.264 − 29 =
  16. 16.359 − 96 =
  17. 17.173 − 98 =
  18. 18.467 − 56 =
  19. 19.269 − 59 =
  20. 20.204 − 97 =
  21. 21.119 − 97 =
  22. 22.568 − 68 =
  23. 23.400 − 36 =
  24. 24.112 − 59 =
  25. 25.443 − 87 =
  26. 26.239 − 58 =
  27. 27.353 − 36 =
  28. 28.181 − 87 =
  29. 29.526 − 89 =
  30. 30.196 − 17 =
  31. 31.467 − 26 =
  32. 32.316 − 46 =
  33. 33.209 − 28 =
  34. 34.284 − 56 =
  35. 35.393 − 67 =
  36. 36.524 − 96 =
  37. 37.77 − 18 =
  38. 38.166 − 89 =
  39. 39.482 − 56 =
  40. 40.374 − 59 =

Answer key

  1. 21
  2. 173
  3. 217
  4. 52
  5. 259
  6. 160
  7. 31
  8. 491
  9. 95
  10. 86
  11. 400
  12. 203
  13. 389
  14. 105
  15. 235
  16. 263
  17. 75
  18. 411
  19. 210
  20. 107
  21. 22
  22. 500
  23. 364
  24. 53
  25. 356
  26. 181
  27. 317
  28. 94
  29. 437
  30. 179
  31. 441
  32. 270
  33. 181
  34. 228
  35. 326
  36. 428
  37. 59
  38. 77
  39. 426
  40. 315

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