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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 450 · 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. 1.400 − 27 =
  2. 2.165 − 56 =
  3. 3.544 − 38 =
  4. 4.94 − 79 =
  5. 5.382 − 26 =
  6. 6.325 − 87 =
  7. 7.82 − 69 =
  8. 8.367 − 46 =
  9. 9.199 − 36 =
  10. 10.197 − 88 =
  11. 11.108 − 77 =
  12. 12.108 − 16 =
  13. 13.256 − 99 =
  14. 14.513 − 99 =
  15. 15.205 − 87 =
  16. 16.451 − 49 =
  17. 17.132 − 49 =
  18. 18.378 − 88 =
  19. 19.311 − 46 =
  20. 20.215 − 19 =
  21. 21.154 − 38 =
  22. 22.165 − 86 =
  23. 23.452 − 77 =
  24. 24.201 − 98 =
  25. 25.293 − 39 =
  26. 26.508 − 58 =
  27. 27.201 − 86 =
  28. 28.593 − 69 =
  29. 29.313 − 69 =
  30. 30.156 − 38 =
  31. 31.93 − 39 =
  32. 32.156 − 98 =
  33. 33.570 − 77 =
  34. 34.430 − 89 =
  35. 35.553 − 89 =
  36. 36.255 − 48 =
  37. 37.463 − 57 =
  38. 38.109 − 27 =
  39. 39.349 − 76 =
  40. 40.149 − 97 =

Answer key

  1. 373
  2. 109
  3. 506
  4. 15
  5. 356
  6. 238
  7. 13
  8. 321
  9. 163
  10. 109
  11. 31
  12. 92
  13. 157
  14. 414
  15. 118
  16. 402
  17. 83
  18. 290
  19. 265
  20. 196
  21. 116
  22. 79
  23. 375
  24. 103
  25. 254
  26. 450
  27. 115
  28. 524
  29. 244
  30. 118
  31. 54
  32. 58
  33. 493
  34. 341
  35. 464
  36. 207
  37. 406
  38. 82
  39. 273
  40. 52

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