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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 24 · 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. 1.67 − 47 =
  2. 2.135 − 49 =
  3. 3.64 − 49 =
  4. 4.560 − 89 =
  5. 5.293 − 37 =
  6. 6.365 − 29 =
  7. 7.596 − 56 =
  8. 8.320 − 16 =
  9. 9.279 − 68 =
  10. 10.489 − 68 =
  11. 11.419 − 29 =
  12. 12.160 − 89 =
  13. 13.473 − 78 =
  14. 14.197 − 96 =
  15. 15.157 − 16 =
  16. 16.195 − 89 =
  17. 17.143 − 76 =
  18. 18.96 − 77 =
  19. 19.54 − 39 =
  20. 20.65 − 38 =
  21. 21.365 − 77 =
  22. 22.416 − 66 =
  23. 23.321 − 77 =
  24. 24.207 − 57 =
  25. 25.202 − 79 =
  26. 26.294 − 16 =
  27. 27.68 − 38 =
  28. 28.429 − 29 =
  29. 29.157 − 87 =
  30. 30.371 − 69 =
  31. 31.214 − 38 =
  32. 32.104 − 19 =
  33. 33.477 − 77 =
  34. 34.380 − 38 =
  35. 35.438 − 39 =
  36. 36.594 − 56 =
  37. 37.239 − 19 =
  38. 38.170 − 16 =
  39. 39.147 − 47 =
  40. 40.305 − 87 =

Answer key

  1. 20
  2. 86
  3. 15
  4. 471
  5. 256
  6. 336
  7. 540
  8. 304
  9. 211
  10. 421
  11. 390
  12. 71
  13. 395
  14. 101
  15. 141
  16. 106
  17. 67
  18. 19
  19. 15
  20. 27
  21. 288
  22. 350
  23. 244
  24. 150
  25. 123
  26. 278
  27. 30
  28. 400
  29. 70
  30. 302
  31. 176
  32. 85
  33. 400
  34. 342
  35. 399
  36. 538
  37. 220
  38. 154
  39. 100
  40. 218

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