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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 548 · 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. 1.491 − 27 =
  2. 2.186 − 86 =
  3. 3.181 − 69 =
  4. 4.279 − 17 =
  5. 5.357 − 97 =
  6. 6.331 − 77 =
  7. 7.516 − 57 =
  8. 8.62 − 27 =
  9. 9.296 − 39 =
  10. 10.337 − 48 =
  11. 11.407 − 28 =
  12. 12.126 − 78 =
  13. 13.476 − 87 =
  14. 14.216 − 98 =
  15. 15.468 − 98 =
  16. 16.134 − 99 =
  17. 17.297 − 46 =
  18. 18.94 − 16 =
  19. 19.155 − 88 =
  20. 20.91 − 57 =
  21. 21.348 − 89 =
  22. 22.168 − 76 =
  23. 23.313 − 69 =
  24. 24.449 − 39 =
  25. 25.483 − 87 =
  26. 26.269 − 16 =
  27. 27.456 − 17 =
  28. 28.182 − 59 =
  29. 29.351 − 78 =
  30. 30.348 − 77 =
  31. 31.160 − 57 =
  32. 32.284 − 67 =
  33. 33.142 − 87 =
  34. 34.453 − 38 =
  35. 35.179 − 18 =
  36. 36.565 − 47 =
  37. 37.272 − 79 =
  38. 38.105 − 89 =
  39. 39.449 − 16 =
  40. 40.156 − 86 =

Answer key

  1. 464
  2. 100
  3. 112
  4. 262
  5. 260
  6. 254
  7. 459
  8. 35
  9. 257
  10. 289
  11. 379
  12. 48
  13. 389
  14. 118
  15. 370
  16. 35
  17. 251
  18. 78
  19. 67
  20. 34
  21. 259
  22. 92
  23. 244
  24. 410
  25. 396
  26. 253
  27. 439
  28. 123
  29. 273
  30. 271
  31. 103
  32. 217
  33. 55
  34. 415
  35. 161
  36. 518
  37. 193
  38. 16
  39. 433
  40. 70

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