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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 821 · 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. 1.176 − 27 =
  2. 2.350 − 88 =
  3. 3.211 − 16 =
  4. 4.460 − 16 =
  5. 5.110 − 37 =
  6. 6.364 − 26 =
  7. 7.366 − 48 =
  8. 8.80 − 28 =
  9. 9.255 − 79 =
  10. 10.134 − 79 =
  11. 11.369 − 76 =
  12. 12.172 − 38 =
  13. 13.355 − 16 =
  14. 14.178 − 58 =
  15. 15.199 − 16 =
  16. 16.133 − 47 =
  17. 17.521 − 99 =
  18. 18.572 − 48 =
  19. 19.339 − 96 =
  20. 20.235 − 78 =
  21. 21.564 − 96 =
  22. 22.342 − 67 =
  23. 23.84 − 29 =
  24. 24.535 − 88 =
  25. 25.433 − 47 =
  26. 26.119 − 57 =
  27. 27.454 − 69 =
  28. 28.243 − 28 =
  29. 29.375 − 18 =
  30. 30.540 − 89 =
  31. 31.439 − 88 =
  32. 32.234 − 67 =
  33. 33.304 − 68 =
  34. 34.69 − 26 =
  35. 35.294 − 17 =
  36. 36.317 − 18 =
  37. 37.119 − 67 =
  38. 38.138 − 47 =
  39. 39.86 − 46 =
  40. 40.190 − 89 =

Answer key

  1. 149
  2. 262
  3. 195
  4. 444
  5. 73
  6. 338
  7. 318
  8. 52
  9. 176
  10. 55
  11. 293
  12. 134
  13. 339
  14. 120
  15. 183
  16. 86
  17. 422
  18. 524
  19. 243
  20. 157
  21. 468
  22. 275
  23. 55
  24. 447
  25. 386
  26. 62
  27. 385
  28. 215
  29. 357
  30. 451
  31. 351
  32. 167
  33. 236
  34. 43
  35. 277
  36. 299
  37. 52
  38. 91
  39. 40
  40. 101

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