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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 604 · 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. 1.320 − 46 =
  2. 2.72 − 56 =
  3. 3.100 − 47 =
  4. 4.188 − 99 =
  5. 5.326 − 47 =
  6. 6.80 − 78 =
  7. 7.430 − 46 =
  8. 8.237 − 79 =
  9. 9.229 − 48 =
  10. 10.127 − 68 =
  11. 11.531 − 76 =
  12. 12.231 − 87 =
  13. 13.273 − 26 =
  14. 14.390 − 67 =
  15. 15.190 − 86 =
  16. 16.489 − 27 =
  17. 17.583 − 58 =
  18. 18.506 − 28 =
  19. 19.228 − 98 =
  20. 20.126 − 59 =
  21. 21.577 − 16 =
  22. 22.460 − 38 =
  23. 23.332 − 87 =
  24. 24.400 − 38 =
  25. 25.503 − 86 =
  26. 26.375 − 26 =
  27. 27.575 − 36 =
  28. 28.321 − 47 =
  29. 29.309 − 37 =
  30. 30.449 − 46 =
  31. 31.471 − 36 =
  32. 32.188 − 39 =
  33. 33.256 − 58 =
  34. 34.70 − 37 =
  35. 35.579 − 67 =
  36. 36.278 − 67 =
  37. 37.128 − 16 =
  38. 38.238 − 66 =
  39. 39.383 − 37 =
  40. 40.177 − 96 =

Answer key

  1. 274
  2. 16
  3. 53
  4. 89
  5. 279
  6. 2
  7. 384
  8. 158
  9. 181
  10. 59
  11. 455
  12. 144
  13. 247
  14. 323
  15. 104
  16. 462
  17. 525
  18. 478
  19. 130
  20. 67
  21. 561
  22. 422
  23. 245
  24. 362
  25. 417
  26. 349
  27. 539
  28. 274
  29. 272
  30. 403
  31. 435
  32. 149
  33. 198
  34. 33
  35. 512
  36. 211
  37. 112
  38. 172
  39. 346
  40. 81

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