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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 730 · 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. 1.362 − 46 =
  2. 2.393 − 87 =
  3. 3.144 − 36 =
  4. 4.400 − 48 =
  5. 5.120 − 16 =
  6. 6.577 − 56 =
  7. 7.458 − 27 =
  8. 8.520 − 16 =
  9. 9.439 − 78 =
  10. 10.273 − 86 =
  11. 11.176 − 36 =
  12. 12.252 − 59 =
  13. 13.576 − 37 =
  14. 14.537 − 47 =
  15. 15.232 − 38 =
  16. 16.560 − 49 =
  17. 17.308 − 38 =
  18. 18.156 − 87 =
  19. 19.55 − 27 =
  20. 20.158 − 19 =
  21. 21.143 − 38 =
  22. 22.352 − 88 =
  23. 23.69 − 29 =
  24. 24.100 − 59 =
  25. 25.530 − 69 =
  26. 26.155 − 19 =
  27. 27.300 − 77 =
  28. 28.146 − 97 =
  29. 29.486 − 67 =
  30. 30.550 − 88 =
  31. 31.215 − 99 =
  32. 32.519 − 96 =
  33. 33.437 − 46 =
  34. 34.575 − 99 =
  35. 35.476 − 37 =
  36. 36.125 − 96 =
  37. 37.361 − 39 =
  38. 38.197 − 76 =
  39. 39.177 − 37 =
  40. 40.295 − 77 =

Answer key

  1. 316
  2. 306
  3. 108
  4. 352
  5. 104
  6. 521
  7. 431
  8. 504
  9. 361
  10. 187
  11. 140
  12. 193
  13. 539
  14. 490
  15. 194
  16. 511
  17. 270
  18. 69
  19. 28
  20. 139
  21. 105
  22. 264
  23. 40
  24. 41
  25. 461
  26. 136
  27. 223
  28. 49
  29. 419
  30. 462
  31. 116
  32. 423
  33. 391
  34. 476
  35. 439
  36. 29
  37. 322
  38. 121
  39. 140
  40. 218

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