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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 298 · 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. 1.241 − 69 =
  2. 2.142 − 19 =
  3. 3.590 − 98 =
  4. 4.393 − 46 =
  5. 5.129 − 29 =
  6. 6.335 − 89 =
  7. 7.415 − 78 =
  8. 8.350 − 28 =
  9. 9.182 − 29 =
  10. 10.222 − 97 =
  11. 11.564 − 76 =
  12. 12.174 − 86 =
  13. 13.517 − 58 =
  14. 14.64 − 27 =
  15. 15.76 − 28 =
  16. 16.254 − 47 =
  17. 17.595 − 56 =
  18. 18.266 − 37 =
  19. 19.307 − 46 =
  20. 20.251 − 58 =
  21. 21.458 − 68 =
  22. 22.505 − 59 =
  23. 23.384 − 16 =
  24. 24.362 − 18 =
  25. 25.344 − 27 =
  26. 26.81 − 26 =
  27. 27.438 − 26 =
  28. 28.319 − 37 =
  29. 29.534 − 56 =
  30. 30.240 − 58 =
  31. 31.155 − 76 =
  32. 32.330 − 56 =
  33. 33.153 − 78 =
  34. 34.120 − 89 =
  35. 35.358 − 37 =
  36. 36.408 − 26 =
  37. 37.358 − 98 =
  38. 38.397 − 26 =
  39. 39.492 − 37 =
  40. 40.141 − 17 =

Answer key

  1. 172
  2. 123
  3. 492
  4. 347
  5. 100
  6. 246
  7. 337
  8. 322
  9. 153
  10. 125
  11. 488
  12. 88
  13. 459
  14. 37
  15. 48
  16. 207
  17. 539
  18. 229
  19. 261
  20. 193
  21. 390
  22. 446
  23. 368
  24. 344
  25. 317
  26. 55
  27. 412
  28. 282
  29. 478
  30. 182
  31. 79
  32. 274
  33. 75
  34. 31
  35. 321
  36. 382
  37. 260
  38. 371
  39. 455
  40. 124

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