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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 74 · 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. 1.508 − 98 =
  2. 2.102 − 17 =
  3. 3.578 − 76 =
  4. 4.72 − 16 =
  5. 5.58 − 49 =
  6. 6.351 − 88 =
  7. 7.74 − 66 =
  8. 8.436 − 98 =
  9. 9.295 − 17 =
  10. 10.244 − 66 =
  11. 11.186 − 18 =
  12. 12.243 − 97 =
  13. 13.228 − 27 =
  14. 14.165 − 26 =
  15. 15.596 − 98 =
  16. 16.577 − 69 =
  17. 17.528 − 19 =
  18. 18.341 − 29 =
  19. 19.584 − 36 =
  20. 20.203 − 28 =
  21. 21.445 − 49 =
  22. 22.437 − 99 =
  23. 23.107 − 78 =
  24. 24.460 − 69 =
  25. 25.462 − 29 =
  26. 26.161 − 78 =
  27. 27.209 − 39 =
  28. 28.225 − 57 =
  29. 29.289 − 77 =
  30. 30.267 − 28 =
  31. 31.184 − 37 =
  32. 32.125 − 49 =
  33. 33.146 − 98 =
  34. 34.442 − 36 =
  35. 35.317 − 87 =
  36. 36.381 − 36 =
  37. 37.234 − 79 =
  38. 38.493 − 17 =
  39. 39.380 − 96 =
  40. 40.384 − 99 =

Answer key

  1. 410
  2. 85
  3. 502
  4. 56
  5. 9
  6. 263
  7. 8
  8. 338
  9. 278
  10. 178
  11. 168
  12. 146
  13. 201
  14. 139
  15. 498
  16. 508
  17. 509
  18. 312
  19. 548
  20. 175
  21. 396
  22. 338
  23. 29
  24. 391
  25. 433
  26. 83
  27. 170
  28. 168
  29. 212
  30. 239
  31. 147
  32. 76
  33. 48
  34. 406
  35. 230
  36. 345
  37. 155
  38. 476
  39. 284
  40. 285

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