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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 939 · 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. 1.358 − 49 =
  2. 2.470 − 27 =
  3. 3.395 − 37 =
  4. 4.534 − 36 =
  5. 5.499 − 76 =
  6. 6.541 − 68 =
  7. 7.254 − 59 =
  8. 8.165 − 96 =
  9. 9.487 − 46 =
  10. 10.522 − 86 =
  11. 11.126 − 38 =
  12. 12.162 − 18 =
  13. 13.162 − 97 =
  14. 14.134 − 17 =
  15. 15.481 − 19 =
  16. 16.478 − 77 =
  17. 17.159 − 99 =
  18. 18.282 − 37 =
  19. 19.197 − 99 =
  20. 20.350 − 56 =
  21. 21.500 − 77 =
  22. 22.429 − 76 =
  23. 23.232 − 89 =
  24. 24.206 − 86 =
  25. 25.536 − 56 =
  26. 26.523 − 19 =
  27. 27.423 − 96 =
  28. 28.155 − 59 =
  29. 29.321 − 78 =
  30. 30.239 − 96 =
  31. 31.408 − 27 =
  32. 32.269 − 29 =
  33. 33.377 − 98 =
  34. 34.84 − 28 =
  35. 35.422 − 28 =
  36. 36.592 − 39 =
  37. 37.329 − 99 =
  38. 38.557 − 26 =
  39. 39.127 − 48 =
  40. 40.547 − 96 =

Answer key

  1. 309
  2. 443
  3. 358
  4. 498
  5. 423
  6. 473
  7. 195
  8. 69
  9. 441
  10. 436
  11. 88
  12. 144
  13. 65
  14. 117
  15. 462
  16. 401
  17. 60
  18. 245
  19. 98
  20. 294
  21. 423
  22. 353
  23. 143
  24. 120
  25. 480
  26. 504
  27. 327
  28. 96
  29. 243
  30. 143
  31. 381
  32. 240
  33. 279
  34. 56
  35. 394
  36. 553
  37. 230
  38. 531
  39. 79
  40. 451

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