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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 62 · 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. 1.550 − 46 =
  2. 2.106 − 58 =
  3. 3.348 − 58 =
  4. 4.392 − 87 =
  5. 5.550 − 66 =
  6. 6.120 − 37 =
  7. 7.65 − 17 =
  8. 8.255 − 28 =
  9. 9.433 − 49 =
  10. 10.210 − 39 =
  11. 11.66 − 59 =
  12. 12.138 − 98 =
  13. 13.498 − 28 =
  14. 14.164 − 59 =
  15. 15.63 − 16 =
  16. 16.235 − 49 =
  17. 17.111 − 86 =
  18. 18.314 − 98 =
  19. 19.436 − 29 =
  20. 20.134 − 79 =
  21. 21.137 − 67 =
  22. 22.366 − 79 =
  23. 23.91 − 69 =
  24. 24.202 − 86 =
  25. 25.563 − 57 =
  26. 26.330 − 88 =
  27. 27.216 − 77 =
  28. 28.181 − 97 =
  29. 29.263 − 88 =
  30. 30.87 − 77 =
  31. 31.193 − 18 =
  32. 32.230 − 96 =
  33. 33.123 − 99 =
  34. 34.498 − 97 =
  35. 35.135 − 99 =
  36. 36.260 − 29 =
  37. 37.455 − 96 =
  38. 38.497 − 38 =
  39. 39.107 − 19 =
  40. 40.207 − 97 =

Answer key

  1. 504
  2. 48
  3. 290
  4. 305
  5. 484
  6. 83
  7. 48
  8. 227
  9. 384
  10. 171
  11. 7
  12. 40
  13. 470
  14. 105
  15. 47
  16. 186
  17. 25
  18. 216
  19. 407
  20. 55
  21. 70
  22. 287
  23. 22
  24. 116
  25. 506
  26. 242
  27. 139
  28. 84
  29. 175
  30. 10
  31. 175
  32. 134
  33. 24
  34. 401
  35. 36
  36. 231
  37. 359
  38. 459
  39. 88
  40. 110

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