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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 667 · 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. 1.84 − 18 =
  2. 2.476 − 66 =
  3. 3.94 − 59 =
  4. 4.392 − 19 =
  5. 5.349 − 88 =
  6. 6.527 − 99 =
  7. 7.209 − 49 =
  8. 8.333 − 36 =
  9. 9.373 − 19 =
  10. 10.320 − 67 =
  11. 11.145 − 38 =
  12. 12.137 − 19 =
  13. 13.283 − 49 =
  14. 14.459 − 39 =
  15. 15.439 − 46 =
  16. 16.521 − 27 =
  17. 17.397 − 38 =
  18. 18.584 − 48 =
  19. 19.170 − 27 =
  20. 20.198 − 87 =
  21. 21.264 − 37 =
  22. 22.178 − 46 =
  23. 23.473 − 17 =
  24. 24.187 − 87 =
  25. 25.336 − 97 =
  26. 26.192 − 49 =
  27. 27.172 − 39 =
  28. 28.183 − 96 =
  29. 29.536 − 26 =
  30. 30.187 − 98 =
  31. 31.240 − 38 =
  32. 32.545 − 16 =
  33. 33.136 − 99 =
  34. 34.331 − 48 =
  35. 35.589 − 37 =
  36. 36.246 − 26 =
  37. 37.77 − 38 =
  38. 38.96 − 18 =
  39. 39.158 − 28 =
  40. 40.479 − 57 =

Answer key

  1. 66
  2. 410
  3. 35
  4. 373
  5. 261
  6. 428
  7. 160
  8. 297
  9. 354
  10. 253
  11. 107
  12. 118
  13. 234
  14. 420
  15. 393
  16. 494
  17. 359
  18. 536
  19. 143
  20. 111
  21. 227
  22. 132
  23. 456
  24. 100
  25. 239
  26. 143
  27. 133
  28. 87
  29. 510
  30. 89
  31. 202
  32. 529
  33. 37
  34. 283
  35. 552
  36. 220
  37. 39
  38. 78
  39. 130
  40. 422

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