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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 33 · 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. 1.577 − 49 =
  2. 2.539 − 76 =
  3. 3.422 − 17 =
  4. 4.334 − 49 =
  5. 5.491 − 96 =
  6. 6.289 − 38 =
  7. 7.93 − 69 =
  8. 8.441 − 97 =
  9. 9.491 − 39 =
  10. 10.499 − 79 =
  11. 11.359 − 58 =
  12. 12.76 − 39 =
  13. 13.385 − 37 =
  14. 14.201 − 26 =
  15. 15.150 − 28 =
  16. 16.116 − 66 =
  17. 17.225 − 78 =
  18. 18.446 − 76 =
  19. 19.485 − 76 =
  20. 20.145 − 36 =
  21. 21.129 − 48 =
  22. 22.379 − 39 =
  23. 23.506 − 98 =
  24. 24.174 − 67 =
  25. 25.180 − 88 =
  26. 26.157 − 76 =
  27. 27.295 − 67 =
  28. 28.467 − 78 =
  29. 29.470 − 17 =
  30. 30.352 − 19 =
  31. 31.352 − 56 =
  32. 32.138 − 28 =
  33. 33.130 − 28 =
  34. 34.177 − 88 =
  35. 35.398 − 17 =
  36. 36.303 − 78 =
  37. 37.98 − 97 =
  38. 38.463 − 77 =
  39. 39.117 − 17 =
  40. 40.100 − 87 =

Answer key

  1. 528
  2. 463
  3. 405
  4. 285
  5. 395
  6. 251
  7. 24
  8. 344
  9. 452
  10. 420
  11. 301
  12. 37
  13. 348
  14. 175
  15. 122
  16. 50
  17. 147
  18. 370
  19. 409
  20. 109
  21. 81
  22. 340
  23. 408
  24. 107
  25. 92
  26. 81
  27. 228
  28. 389
  29. 453
  30. 333
  31. 296
  32. 110
  33. 102
  34. 89
  35. 381
  36. 225
  37. 1
  38. 386
  39. 100
  40. 13

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