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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 396 · 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. 1.564 − 79 =
  2. 2.52 − 27 =
  3. 3.327 − 89 =
  4. 4.186 − 16 =
  5. 5.449 − 27 =
  6. 6.255 − 96 =
  7. 7.124 − 58 =
  8. 8.319 − 48 =
  9. 9.543 − 29 =
  10. 10.396 − 56 =
  11. 11.199 − 19 =
  12. 12.87 − 76 =
  13. 13.365 − 69 =
  14. 14.523 − 38 =
  15. 15.94 − 37 =
  16. 16.330 − 26 =
  17. 17.55 − 48 =
  18. 18.72 − 29 =
  19. 19.347 − 37 =
  20. 20.239 − 99 =
  21. 21.588 − 68 =
  22. 22.152 − 16 =
  23. 23.536 − 27 =
  24. 24.277 − 97 =
  25. 25.400 − 98 =
  26. 26.118 − 36 =
  27. 27.161 − 67 =
  28. 28.150 − 78 =
  29. 29.419 − 18 =
  30. 30.82 − 76 =
  31. 31.429 − 36 =
  32. 32.167 − 88 =
  33. 33.462 − 36 =
  34. 34.444 − 57 =
  35. 35.172 − 89 =
  36. 36.305 − 37 =
  37. 37.500 − 27 =
  38. 38.265 − 46 =
  39. 39.368 − 67 =
  40. 40.133 − 18 =

Answer key

  1. 485
  2. 25
  3. 238
  4. 170
  5. 422
  6. 159
  7. 66
  8. 271
  9. 514
  10. 340
  11. 180
  12. 11
  13. 296
  14. 485
  15. 57
  16. 304
  17. 7
  18. 43
  19. 310
  20. 140
  21. 520
  22. 136
  23. 509
  24. 180
  25. 302
  26. 82
  27. 94
  28. 72
  29. 401
  30. 6
  31. 393
  32. 79
  33. 426
  34. 387
  35. 83
  36. 268
  37. 473
  38. 219
  39. 301
  40. 115

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