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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 42 · 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. 1.155 − 66 =
  2. 2.465 − 58 =
  3. 3.378 − 38 =
  4. 4.455 − 68 =
  5. 5.397 − 27 =
  6. 6.308 − 58 =
  7. 7.80 − 59 =
  8. 8.348 − 47 =
  9. 9.154 − 18 =
  10. 10.105 − 16 =
  11. 11.447 − 46 =
  12. 12.196 − 69 =
  13. 13.399 − 89 =
  14. 14.316 − 76 =
  15. 15.141 − 78 =
  16. 16.215 − 28 =
  17. 17.52 − 49 =
  18. 18.204 − 57 =
  19. 19.221 − 49 =
  20. 20.539 − 56 =
  21. 21.195 − 28 =
  22. 22.186 − 16 =
  23. 23.462 − 76 =
  24. 24.362 − 28 =
  25. 25.490 − 69 =
  26. 26.87 − 56 =
  27. 27.162 − 66 =
  28. 28.572 − 98 =
  29. 29.114 − 69 =
  30. 30.222 − 78 =
  31. 31.560 − 79 =
  32. 32.376 − 86 =
  33. 33.215 − 27 =
  34. 34.175 − 78 =
  35. 35.436 − 47 =
  36. 36.134 − 38 =
  37. 37.117 − 48 =
  38. 38.502 − 16 =
  39. 39.398 − 57 =
  40. 40.391 − 68 =

Answer key

  1. 89
  2. 407
  3. 340
  4. 387
  5. 370
  6. 250
  7. 21
  8. 301
  9. 136
  10. 89
  11. 401
  12. 127
  13. 310
  14. 240
  15. 63
  16. 187
  17. 3
  18. 147
  19. 172
  20. 483
  21. 167
  22. 170
  23. 386
  24. 334
  25. 421
  26. 31
  27. 96
  28. 474
  29. 45
  30. 144
  31. 481
  32. 290
  33. 188
  34. 97
  35. 389
  36. 96
  37. 69
  38. 486
  39. 341
  40. 323

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