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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 739 · 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. 1.434 − 88 =
  2. 2.406 − 18 =
  3. 3.395 − 39 =
  4. 4.512 − 86 =
  5. 5.204 − 57 =
  6. 6.487 − 47 =
  7. 7.458 − 66 =
  8. 8.336 − 56 =
  9. 9.335 − 18 =
  10. 10.230 − 67 =
  11. 11.112 − 36 =
  12. 12.390 − 27 =
  13. 13.57 − 29 =
  14. 14.453 − 18 =
  15. 15.143 − 19 =
  16. 16.89 − 58 =
  17. 17.84 − 78 =
  18. 18.478 − 47 =
  19. 19.205 − 89 =
  20. 20.491 − 36 =
  21. 21.186 − 99 =
  22. 22.228 − 37 =
  23. 23.374 − 36 =
  24. 24.224 − 97 =
  25. 25.457 − 86 =
  26. 26.289 − 88 =
  27. 27.494 − 38 =
  28. 28.227 − 66 =
  29. 29.445 − 97 =
  30. 30.132 − 57 =
  31. 31.58 − 38 =
  32. 32.483 − 27 =
  33. 33.554 − 99 =
  34. 34.149 − 38 =
  35. 35.209 − 66 =
  36. 36.137 − 16 =
  37. 37.465 − 78 =
  38. 38.164 − 99 =
  39. 39.445 − 26 =
  40. 40.481 − 76 =

Answer key

  1. 346
  2. 388
  3. 356
  4. 426
  5. 147
  6. 440
  7. 392
  8. 280
  9. 317
  10. 163
  11. 76
  12. 363
  13. 28
  14. 435
  15. 124
  16. 31
  17. 6
  18. 431
  19. 116
  20. 455
  21. 87
  22. 191
  23. 338
  24. 127
  25. 371
  26. 201
  27. 456
  28. 161
  29. 348
  30. 75
  31. 20
  32. 456
  33. 455
  34. 111
  35. 143
  36. 121
  37. 387
  38. 65
  39. 419
  40. 405

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