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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 506 · 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. 1.136 − 58 =
  2. 2.536 − 19 =
  3. 3.372 − 39 =
  4. 4.291 − 59 =
  5. 5.96 − 79 =
  6. 6.529 − 77 =
  7. 7.347 − 96 =
  8. 8.52 − 38 =
  9. 9.489 − 36 =
  10. 10.105 − 26 =
  11. 11.519 − 17 =
  12. 12.273 − 19 =
  13. 13.189 − 47 =
  14. 14.570 − 46 =
  15. 15.183 − 27 =
  16. 16.287 − 29 =
  17. 17.168 − 36 =
  18. 18.425 − 28 =
  19. 19.231 − 66 =
  20. 20.102 − 36 =
  21. 21.70 − 39 =
  22. 22.147 − 86 =
  23. 23.551 − 96 =
  24. 24.385 − 98 =
  25. 25.315 − 78 =
  26. 26.287 − 49 =
  27. 27.271 − 98 =
  28. 28.508 − 17 =
  29. 29.218 − 27 =
  30. 30.556 − 37 =
  31. 31.195 − 46 =
  32. 32.578 − 48 =
  33. 33.148 − 76 =
  34. 34.155 − 89 =
  35. 35.263 − 87 =
  36. 36.347 − 38 =
  37. 37.505 − 27 =
  38. 38.339 − 36 =
  39. 39.392 − 28 =
  40. 40.201 − 16 =

Answer key

  1. 78
  2. 517
  3. 333
  4. 232
  5. 17
  6. 452
  7. 251
  8. 14
  9. 453
  10. 79
  11. 502
  12. 254
  13. 142
  14. 524
  15. 156
  16. 258
  17. 132
  18. 397
  19. 165
  20. 66
  21. 31
  22. 61
  23. 455
  24. 287
  25. 237
  26. 238
  27. 173
  28. 491
  29. 191
  30. 519
  31. 149
  32. 530
  33. 72
  34. 66
  35. 176
  36. 309
  37. 478
  38. 303
  39. 364
  40. 185

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