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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 191 · 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. 1.69 − 56 =
  2. 2.352 − 97 =
  3. 3.62 − 48 =
  4. 4.589 − 59 =
  5. 5.445 − 67 =
  6. 6.388 − 19 =
  7. 7.196 − 17 =
  8. 8.136 − 99 =
  9. 9.378 − 16 =
  10. 10.108 − 59 =
  11. 11.421 − 76 =
  12. 12.383 − 59 =
  13. 13.58 − 37 =
  14. 14.508 − 57 =
  15. 15.412 − 69 =
  16. 16.375 − 88 =
  17. 17.297 − 37 =
  18. 18.360 − 39 =
  19. 19.77 − 66 =
  20. 20.113 − 38 =
  21. 21.95 − 78 =
  22. 22.226 − 26 =
  23. 23.362 − 39 =
  24. 24.200 − 99 =
  25. 25.480 − 69 =
  26. 26.64 − 29 =
  27. 27.513 − 67 =
  28. 28.228 − 97 =
  29. 29.310 − 57 =
  30. 30.59 − 46 =
  31. 31.227 − 89 =
  32. 32.429 − 86 =
  33. 33.419 − 68 =
  34. 34.533 − 96 =
  35. 35.350 − 46 =
  36. 36.549 − 76 =
  37. 37.544 − 69 =
  38. 38.320 − 28 =
  39. 39.98 − 17 =
  40. 40.176 − 99 =

Answer key

  1. 13
  2. 255
  3. 14
  4. 530
  5. 378
  6. 369
  7. 179
  8. 37
  9. 362
  10. 49
  11. 345
  12. 324
  13. 21
  14. 451
  15. 343
  16. 287
  17. 260
  18. 321
  19. 11
  20. 75
  21. 17
  22. 200
  23. 323
  24. 101
  25. 411
  26. 35
  27. 446
  28. 131
  29. 253
  30. 13
  31. 138
  32. 343
  33. 351
  34. 437
  35. 304
  36. 473
  37. 475
  38. 292
  39. 81
  40. 77

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