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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 629 · 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. 1.107 − 56 =
  2. 2.570 − 47 =
  3. 3.161 − 99 =
  4. 4.513 − 28 =
  5. 5.183 − 87 =
  6. 6.135 − 79 =
  7. 7.355 − 29 =
  8. 8.275 − 18 =
  9. 9.457 − 36 =
  10. 10.230 − 79 =
  11. 11.140 − 77 =
  12. 12.186 − 49 =
  13. 13.475 − 27 =
  14. 14.106 − 29 =
  15. 15.372 − 36 =
  16. 16.52 − 18 =
  17. 17.348 − 98 =
  18. 18.239 − 58 =
  19. 19.164 − 76 =
  20. 20.219 − 38 =
  21. 21.476 − 28 =
  22. 22.379 − 86 =
  23. 23.372 − 98 =
  24. 24.594 − 56 =
  25. 25.181 − 86 =
  26. 26.211 − 67 =
  27. 27.160 − 16 =
  28. 28.294 − 69 =
  29. 29.191 − 57 =
  30. 30.176 − 57 =
  31. 31.181 − 39 =
  32. 32.67 − 27 =
  33. 33.409 − 59 =
  34. 34.438 − 57 =
  35. 35.109 − 59 =
  36. 36.298 − 58 =
  37. 37.188 − 78 =
  38. 38.311 − 46 =
  39. 39.486 − 48 =
  40. 40.289 − 47 =

Answer key

  1. 51
  2. 523
  3. 62
  4. 485
  5. 96
  6. 56
  7. 326
  8. 257
  9. 421
  10. 151
  11. 63
  12. 137
  13. 448
  14. 77
  15. 336
  16. 34
  17. 250
  18. 181
  19. 88
  20. 181
  21. 448
  22. 293
  23. 274
  24. 538
  25. 95
  26. 144
  27. 144
  28. 225
  29. 134
  30. 119
  31. 142
  32. 40
  33. 350
  34. 381
  35. 50
  36. 240
  37. 110
  38. 265
  39. 438
  40. 242

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