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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 787 · 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. 1.310 − 38 =
  2. 2.507 − 69 =
  3. 3.416 − 58 =
  4. 4.180 − 28 =
  5. 5.150 − 48 =
  6. 6.443 − 39 =
  7. 7.200 − 28 =
  8. 8.279 − 16 =
  9. 9.115 − 86 =
  10. 10.336 − 69 =
  11. 11.461 − 29 =
  12. 12.518 − 59 =
  13. 13.439 − 87 =
  14. 14.449 − 79 =
  15. 15.448 − 16 =
  16. 16.234 − 86 =
  17. 17.78 − 58 =
  18. 18.90 − 48 =
  19. 19.351 − 69 =
  20. 20.234 − 26 =
  21. 21.390 − 76 =
  22. 22.245 − 89 =
  23. 23.394 − 69 =
  24. 24.174 − 29 =
  25. 25.397 − 86 =
  26. 26.423 − 59 =
  27. 27.278 − 69 =
  28. 28.133 − 69 =
  29. 29.451 − 98 =
  30. 30.460 − 66 =
  31. 31.596 − 87 =
  32. 32.164 − 66 =
  33. 33.57 − 39 =
  34. 34.195 − 56 =
  35. 35.539 − 28 =
  36. 36.113 − 79 =
  37. 37.428 − 37 =
  38. 38.83 − 58 =
  39. 39.450 − 58 =
  40. 40.206 − 87 =

Answer key

  1. 272
  2. 438
  3. 358
  4. 152
  5. 102
  6. 404
  7. 172
  8. 263
  9. 29
  10. 267
  11. 432
  12. 459
  13. 352
  14. 370
  15. 432
  16. 148
  17. 20
  18. 42
  19. 282
  20. 208
  21. 314
  22. 156
  23. 325
  24. 145
  25. 311
  26. 364
  27. 209
  28. 64
  29. 353
  30. 394
  31. 509
  32. 98
  33. 18
  34. 139
  35. 511
  36. 34
  37. 391
  38. 25
  39. 392
  40. 119

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