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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 634 · 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. 1.507 − 38 =
  2. 2.540 − 99 =
  3. 3.296 − 79 =
  4. 4.158 − 36 =
  5. 5.251 − 27 =
  6. 6.159 − 77 =
  7. 7.595 − 38 =
  8. 8.434 − 66 =
  9. 9.595 − 67 =
  10. 10.148 − 47 =
  11. 11.583 − 99 =
  12. 12.89 − 18 =
  13. 13.151 − 28 =
  14. 14.545 − 47 =
  15. 15.117 − 59 =
  16. 16.156 − 19 =
  17. 17.160 − 76 =
  18. 18.204 − 37 =
  19. 19.380 − 78 =
  20. 20.456 − 48 =
  21. 21.598 − 77 =
  22. 22.165 − 16 =
  23. 23.232 − 79 =
  24. 24.434 − 16 =
  25. 25.152 − 66 =
  26. 26.191 − 56 =
  27. 27.251 − 46 =
  28. 28.351 − 76 =
  29. 29.593 − 17 =
  30. 30.283 − 88 =
  31. 31.160 − 78 =
  32. 32.185 − 87 =
  33. 33.166 − 99 =
  34. 34.577 − 86 =
  35. 35.271 − 77 =
  36. 36.499 − 79 =
  37. 37.150 − 69 =
  38. 38.345 − 19 =
  39. 39.329 − 37 =
  40. 40.248 − 86 =

Answer key

  1. 469
  2. 441
  3. 217
  4. 122
  5. 224
  6. 82
  7. 557
  8. 368
  9. 528
  10. 101
  11. 484
  12. 71
  13. 123
  14. 498
  15. 58
  16. 137
  17. 84
  18. 167
  19. 302
  20. 408
  21. 521
  22. 149
  23. 153
  24. 418
  25. 86
  26. 135
  27. 205
  28. 275
  29. 576
  30. 195
  31. 82
  32. 98
  33. 67
  34. 491
  35. 194
  36. 420
  37. 81
  38. 326
  39. 292
  40. 162

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