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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 345 · 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. 1.581 − 78 =
  2. 2.232 − 87 =
  3. 3.361 − 36 =
  4. 4.401 − 37 =
  5. 5.326 − 28 =
  6. 6.87 − 76 =
  7. 7.174 − 76 =
  8. 8.73 − 27 =
  9. 9.236 − 78 =
  10. 10.560 − 77 =
  11. 11.145 − 27 =
  12. 12.412 − 59 =
  13. 13.428 − 56 =
  14. 14.138 − 66 =
  15. 15.372 − 97 =
  16. 16.185 − 76 =
  17. 17.545 − 38 =
  18. 18.242 − 68 =
  19. 19.424 − 99 =
  20. 20.341 − 39 =
  21. 21.311 − 96 =
  22. 22.259 − 16 =
  23. 23.512 − 37 =
  24. 24.206 − 28 =
  25. 25.561 − 27 =
  26. 26.180 − 56 =
  27. 27.115 − 66 =
  28. 28.273 − 58 =
  29. 29.195 − 96 =
  30. 30.144 − 89 =
  31. 31.209 − 58 =
  32. 32.146 − 46 =
  33. 33.399 − 27 =
  34. 34.525 − 99 =
  35. 35.267 − 49 =
  36. 36.341 − 77 =
  37. 37.166 − 98 =
  38. 38.60 − 48 =
  39. 39.308 − 86 =
  40. 40.174 − 79 =

Answer key

  1. 503
  2. 145
  3. 325
  4. 364
  5. 298
  6. 11
  7. 98
  8. 46
  9. 158
  10. 483
  11. 118
  12. 353
  13. 372
  14. 72
  15. 275
  16. 109
  17. 507
  18. 174
  19. 325
  20. 302
  21. 215
  22. 243
  23. 475
  24. 178
  25. 534
  26. 124
  27. 49
  28. 215
  29. 99
  30. 55
  31. 151
  32. 100
  33. 372
  34. 426
  35. 218
  36. 264
  37. 68
  38. 12
  39. 222
  40. 95

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