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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 458 · 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. 1.323 − 16 =
  2. 2.135 − 79 =
  3. 3.145 − 28 =
  4. 4.425 − 27 =
  5. 5.166 − 57 =
  6. 6.237 − 97 =
  7. 7.123 − 46 =
  8. 8.193 − 18 =
  9. 9.417 − 27 =
  10. 10.572 − 66 =
  11. 11.242 − 56 =
  12. 12.75 − 26 =
  13. 13.99 − 47 =
  14. 14.576 − 57 =
  15. 15.552 − 47 =
  16. 16.144 − 38 =
  17. 17.345 − 98 =
  18. 18.414 − 66 =
  19. 19.389 − 46 =
  20. 20.432 − 66 =
  21. 21.579 − 66 =
  22. 22.91 − 76 =
  23. 23.406 − 58 =
  24. 24.537 − 89 =
  25. 25.395 − 86 =
  26. 26.67 − 16 =
  27. 27.243 − 67 =
  28. 28.276 − 17 =
  29. 29.159 − 98 =
  30. 30.278 − 26 =
  31. 31.589 − 86 =
  32. 32.275 − 37 =
  33. 33.456 − 89 =
  34. 34.285 − 16 =
  35. 35.496 − 38 =
  36. 36.174 − 78 =
  37. 37.238 − 18 =
  38. 38.152 − 26 =
  39. 39.208 − 38 =
  40. 40.585 − 46 =

Answer key

  1. 307
  2. 56
  3. 117
  4. 398
  5. 109
  6. 140
  7. 77
  8. 175
  9. 390
  10. 506
  11. 186
  12. 49
  13. 52
  14. 519
  15. 505
  16. 106
  17. 247
  18. 348
  19. 343
  20. 366
  21. 513
  22. 15
  23. 348
  24. 448
  25. 309
  26. 51
  27. 176
  28. 259
  29. 61
  30. 252
  31. 503
  32. 238
  33. 367
  34. 269
  35. 458
  36. 96
  37. 220
  38. 126
  39. 170
  40. 539

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