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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 790 · 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. 1.388 − 98 =
  2. 2.457 − 49 =
  3. 3.461 − 27 =
  4. 4.477 − 87 =
  5. 5.556 − 18 =
  6. 6.166 − 87 =
  7. 7.158 − 46 =
  8. 8.120 − 87 =
  9. 9.433 − 87 =
  10. 10.64 − 29 =
  11. 11.564 − 27 =
  12. 12.129 − 79 =
  13. 13.494 − 88 =
  14. 14.120 − 76 =
  15. 15.359 − 66 =
  16. 16.547 − 88 =
  17. 17.89 − 86 =
  18. 18.95 − 47 =
  19. 19.293 − 88 =
  20. 20.268 − 47 =
  21. 21.140 − 18 =
  22. 22.593 − 46 =
  23. 23.507 − 17 =
  24. 24.139 − 57 =
  25. 25.588 − 26 =
  26. 26.230 − 28 =
  27. 27.420 − 77 =
  28. 28.110 − 47 =
  29. 29.578 − 77 =
  30. 30.587 − 86 =
  31. 31.531 − 87 =
  32. 32.165 − 57 =
  33. 33.160 − 57 =
  34. 34.342 − 48 =
  35. 35.216 − 57 =
  36. 36.190 − 69 =
  37. 37.175 − 26 =
  38. 38.341 − 38 =
  39. 39.208 − 77 =
  40. 40.568 − 17 =

Answer key

  1. 290
  2. 408
  3. 434
  4. 390
  5. 538
  6. 79
  7. 112
  8. 33
  9. 346
  10. 35
  11. 537
  12. 50
  13. 406
  14. 44
  15. 293
  16. 459
  17. 3
  18. 48
  19. 205
  20. 221
  21. 122
  22. 547
  23. 490
  24. 82
  25. 562
  26. 202
  27. 343
  28. 63
  29. 501
  30. 501
  31. 444
  32. 108
  33. 103
  34. 294
  35. 159
  36. 121
  37. 149
  38. 303
  39. 131
  40. 551

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