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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 494 · 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. 1.114 − 28 =
  2. 2.544 − 89 =
  3. 3.216 − 36 =
  4. 4.316 − 78 =
  5. 5.122 − 89 =
  6. 6.392 − 26 =
  7. 7.489 − 27 =
  8. 8.442 − 79 =
  9. 9.417 − 38 =
  10. 10.105 − 17 =
  11. 11.144 − 26 =
  12. 12.452 − 67 =
  13. 13.124 − 17 =
  14. 14.107 − 98 =
  15. 15.175 − 89 =
  16. 16.195 − 18 =
  17. 17.422 − 76 =
  18. 18.77 − 46 =
  19. 19.156 − 87 =
  20. 20.365 − 56 =
  21. 21.211 − 87 =
  22. 22.496 − 89 =
  23. 23.384 − 49 =
  24. 24.170 − 99 =
  25. 25.591 − 57 =
  26. 26.593 − 48 =
  27. 27.521 − 19 =
  28. 28.225 − 96 =
  29. 29.512 − 27 =
  30. 30.536 − 69 =
  31. 31.98 − 97 =
  32. 32.63 − 58 =
  33. 33.510 − 18 =
  34. 34.97 − 68 =
  35. 35.214 − 88 =
  36. 36.177 − 97 =
  37. 37.377 − 69 =
  38. 38.418 − 29 =
  39. 39.396 − 19 =
  40. 40.362 − 17 =

Answer key

  1. 86
  2. 455
  3. 180
  4. 238
  5. 33
  6. 366
  7. 462
  8. 363
  9. 379
  10. 88
  11. 118
  12. 385
  13. 107
  14. 9
  15. 86
  16. 177
  17. 346
  18. 31
  19. 69
  20. 309
  21. 124
  22. 407
  23. 335
  24. 71
  25. 534
  26. 545
  27. 502
  28. 129
  29. 485
  30. 467
  31. 1
  32. 5
  33. 492
  34. 29
  35. 126
  36. 80
  37. 308
  38. 389
  39. 377
  40. 345

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