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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 775 · 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. 1.598 − 38 =
  2. 2.81 − 46 =
  3. 3.99 − 88 =
  4. 4.491 − 28 =
  5. 5.534 − 46 =
  6. 6.547 − 89 =
  7. 7.160 − 38 =
  8. 8.257 − 98 =
  9. 9.452 − 17 =
  10. 10.355 − 77 =
  11. 11.224 − 77 =
  12. 12.401 − 78 =
  13. 13.240 − 37 =
  14. 14.292 − 68 =
  15. 15.79 − 29 =
  16. 16.377 − 79 =
  17. 17.522 − 98 =
  18. 18.299 − 79 =
  19. 19.554 − 48 =
  20. 20.274 − 18 =
  21. 21.193 − 27 =
  22. 22.468 − 39 =
  23. 23.132 − 39 =
  24. 24.299 − 28 =
  25. 25.399 − 36 =
  26. 26.441 − 79 =
  27. 27.335 − 27 =
  28. 28.503 − 49 =
  29. 29.288 − 59 =
  30. 30.145 − 97 =
  31. 31.95 − 76 =
  32. 32.159 − 59 =
  33. 33.500 − 37 =
  34. 34.264 − 99 =
  35. 35.137 − 48 =
  36. 36.461 − 27 =
  37. 37.125 − 79 =
  38. 38.316 − 68 =
  39. 39.433 − 68 =
  40. 40.272 − 39 =

Answer key

  1. 560
  2. 35
  3. 11
  4. 463
  5. 488
  6. 458
  7. 122
  8. 159
  9. 435
  10. 278
  11. 147
  12. 323
  13. 203
  14. 224
  15. 50
  16. 298
  17. 424
  18. 220
  19. 506
  20. 256
  21. 166
  22. 429
  23. 93
  24. 271
  25. 363
  26. 362
  27. 308
  28. 454
  29. 229
  30. 48
  31. 19
  32. 100
  33. 463
  34. 165
  35. 89
  36. 434
  37. 46
  38. 248
  39. 365
  40. 233

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