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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 146 · 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. 1.410 − 29 =
  2. 2.458 − 58 =
  3. 3.343 − 87 =
  4. 4.497 − 78 =
  5. 5.57 − 36 =
  6. 6.114 − 86 =
  7. 7.274 − 37 =
  8. 8.409 − 98 =
  9. 9.472 − 87 =
  10. 10.116 − 69 =
  11. 11.169 − 46 =
  12. 12.179 − 38 =
  13. 13.203 − 17 =
  14. 14.397 − 56 =
  15. 15.481 − 87 =
  16. 16.346 − 98 =
  17. 17.216 − 68 =
  18. 18.142 − 86 =
  19. 19.112 − 56 =
  20. 20.222 − 99 =
  21. 21.471 − 47 =
  22. 22.542 − 36 =
  23. 23.478 − 76 =
  24. 24.172 − 86 =
  25. 25.474 − 37 =
  26. 26.560 − 59 =
  27. 27.437 − 98 =
  28. 28.60 − 57 =
  29. 29.568 − 29 =
  30. 30.173 − 88 =
  31. 31.330 − 38 =
  32. 32.470 − 17 =
  33. 33.512 − 56 =
  34. 34.198 − 56 =
  35. 35.251 − 28 =
  36. 36.174 − 76 =
  37. 37.587 − 29 =
  38. 38.433 − 69 =
  39. 39.401 − 18 =
  40. 40.154 − 86 =

Answer key

  1. 381
  2. 400
  3. 256
  4. 419
  5. 21
  6. 28
  7. 237
  8. 311
  9. 385
  10. 47
  11. 123
  12. 141
  13. 186
  14. 341
  15. 394
  16. 248
  17. 148
  18. 56
  19. 56
  20. 123
  21. 424
  22. 506
  23. 402
  24. 86
  25. 437
  26. 501
  27. 339
  28. 3
  29. 539
  30. 85
  31. 292
  32. 453
  33. 456
  34. 142
  35. 223
  36. 98
  37. 558
  38. 364
  39. 383
  40. 68

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