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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 799 · 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. 1.497 − 56 =
  2. 2.476 − 19 =
  3. 3.155 − 29 =
  4. 4.97 − 36 =
  5. 5.91 − 76 =
  6. 6.121 − 66 =
  7. 7.519 − 98 =
  8. 8.77 − 57 =
  9. 9.464 − 36 =
  10. 10.573 − 99 =
  11. 11.430 − 49 =
  12. 12.419 − 58 =
  13. 13.575 − 98 =
  14. 14.278 − 39 =
  15. 15.122 − 79 =
  16. 16.501 − 47 =
  17. 17.464 − 56 =
  18. 18.266 − 39 =
  19. 19.117 − 86 =
  20. 20.514 − 99 =
  21. 21.570 − 88 =
  22. 22.116 − 16 =
  23. 23.128 − 19 =
  24. 24.420 − 87 =
  25. 25.509 − 86 =
  26. 26.267 − 58 =
  27. 27.549 − 26 =
  28. 28.155 − 96 =
  29. 29.436 − 27 =
  30. 30.421 − 18 =
  31. 31.346 − 16 =
  32. 32.265 − 87 =
  33. 33.501 − 19 =
  34. 34.514 − 88 =
  35. 35.302 − 26 =
  36. 36.532 − 77 =
  37. 37.532 − 69 =
  38. 38.146 − 98 =
  39. 39.75 − 67 =
  40. 40.241 − 16 =

Answer key

  1. 441
  2. 457
  3. 126
  4. 61
  5. 15
  6. 55
  7. 421
  8. 20
  9. 428
  10. 474
  11. 381
  12. 361
  13. 477
  14. 239
  15. 43
  16. 454
  17. 408
  18. 227
  19. 31
  20. 415
  21. 482
  22. 100
  23. 109
  24. 333
  25. 423
  26. 209
  27. 523
  28. 59
  29. 409
  30. 403
  31. 330
  32. 178
  33. 482
  34. 426
  35. 276
  36. 455
  37. 463
  38. 48
  39. 8
  40. 225

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