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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 800 · 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. 1.417 − 47 =
  2. 2.591 − 69 =
  3. 3.596 − 79 =
  4. 4.549 − 77 =
  5. 5.123 − 99 =
  6. 6.83 − 66 =
  7. 7.128 − 88 =
  8. 8.358 − 48 =
  9. 9.192 − 29 =
  10. 10.155 − 97 =
  11. 11.593 − 99 =
  12. 12.158 − 67 =
  13. 13.355 − 78 =
  14. 14.147 − 78 =
  15. 15.295 − 26 =
  16. 16.180 − 49 =
  17. 17.227 − 67 =
  18. 18.480 − 96 =
  19. 19.349 − 98 =
  20. 20.431 − 29 =
  21. 21.154 − 76 =
  22. 22.281 − 96 =
  23. 23.123 − 36 =
  24. 24.515 − 86 =
  25. 25.257 − 16 =
  26. 26.358 − 56 =
  27. 27.274 − 27 =
  28. 28.462 − 58 =
  29. 29.251 − 76 =
  30. 30.59 − 27 =
  31. 31.117 − 58 =
  32. 32.59 − 16 =
  33. 33.509 − 29 =
  34. 34.374 − 69 =
  35. 35.111 − 17 =
  36. 36.591 − 98 =
  37. 37.527 − 57 =
  38. 38.547 − 88 =
  39. 39.534 − 36 =
  40. 40.251 − 57 =

Answer key

  1. 370
  2. 522
  3. 517
  4. 472
  5. 24
  6. 17
  7. 40
  8. 310
  9. 163
  10. 58
  11. 494
  12. 91
  13. 277
  14. 69
  15. 269
  16. 131
  17. 160
  18. 384
  19. 251
  20. 402
  21. 78
  22. 185
  23. 87
  24. 429
  25. 241
  26. 302
  27. 247
  28. 404
  29. 175
  30. 32
  31. 59
  32. 43
  33. 480
  34. 305
  35. 94
  36. 493
  37. 470
  38. 459
  39. 498
  40. 194

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