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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 382 · 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. 1.477 − 89 =
  2. 2.108 − 67 =
  3. 3.175 − 47 =
  4. 4.154 − 39 =
  5. 5.361 − 77 =
  6. 6.195 − 98 =
  7. 7.183 − 36 =
  8. 8.149 − 36 =
  9. 9.220 − 59 =
  10. 10.254 − 78 =
  11. 11.374 − 39 =
  12. 12.140 − 18 =
  13. 13.187 − 67 =
  14. 14.457 − 56 =
  15. 15.326 − 17 =
  16. 16.400 − 57 =
  17. 17.559 − 29 =
  18. 18.160 − 47 =
  19. 19.179 − 56 =
  20. 20.338 − 56 =
  21. 21.313 − 28 =
  22. 22.124 − 96 =
  23. 23.283 − 87 =
  24. 24.584 − 18 =
  25. 25.153 − 89 =
  26. 26.539 − 58 =
  27. 27.547 − 79 =
  28. 28.516 − 49 =
  29. 29.227 − 56 =
  30. 30.591 − 79 =
  31. 31.584 − 86 =
  32. 32.171 − 88 =
  33. 33.239 − 17 =
  34. 34.194 − 18 =
  35. 35.305 − 29 =
  36. 36.149 − 89 =
  37. 37.516 − 27 =
  38. 38.63 − 46 =
  39. 39.118 − 77 =
  40. 40.138 − 89 =

Answer key

  1. 388
  2. 41
  3. 128
  4. 115
  5. 284
  6. 97
  7. 147
  8. 113
  9. 161
  10. 176
  11. 335
  12. 122
  13. 120
  14. 401
  15. 309
  16. 343
  17. 530
  18. 113
  19. 123
  20. 282
  21. 285
  22. 28
  23. 196
  24. 566
  25. 64
  26. 481
  27. 468
  28. 467
  29. 171
  30. 512
  31. 498
  32. 83
  33. 222
  34. 176
  35. 276
  36. 60
  37. 489
  38. 17
  39. 41
  40. 49

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