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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 607 · 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. 1.234 − 66 =
  2. 2.208 − 46 =
  3. 3.518 − 88 =
  4. 4.175 − 66 =
  5. 5.116 − 16 =
  6. 6.187 − 27 =
  7. 7.369 − 69 =
  8. 8.283 − 48 =
  9. 9.348 − 88 =
  10. 10.170 − 88 =
  11. 11.395 − 47 =
  12. 12.434 − 47 =
  13. 13.570 − 46 =
  14. 14.308 − 68 =
  15. 15.494 − 26 =
  16. 16.193 − 86 =
  17. 17.184 − 96 =
  18. 18.86 − 37 =
  19. 19.500 − 36 =
  20. 20.101 − 96 =
  21. 21.426 − 18 =
  22. 22.211 − 98 =
  23. 23.428 − 69 =
  24. 24.288 − 76 =
  25. 25.501 − 58 =
  26. 26.164 − 99 =
  27. 27.81 − 46 =
  28. 28.231 − 86 =
  29. 29.278 − 16 =
  30. 30.427 − 78 =
  31. 31.527 − 87 =
  32. 32.222 − 19 =
  33. 33.208 − 67 =
  34. 34.235 − 17 =
  35. 35.131 − 36 =
  36. 36.472 − 76 =
  37. 37.339 − 19 =
  38. 38.485 − 96 =
  39. 39.267 − 29 =
  40. 40.124 − 56 =

Answer key

  1. 168
  2. 162
  3. 430
  4. 109
  5. 100
  6. 160
  7. 300
  8. 235
  9. 260
  10. 82
  11. 348
  12. 387
  13. 524
  14. 240
  15. 468
  16. 107
  17. 88
  18. 49
  19. 464
  20. 5
  21. 408
  22. 113
  23. 359
  24. 212
  25. 443
  26. 65
  27. 35
  28. 145
  29. 262
  30. 349
  31. 440
  32. 203
  33. 141
  34. 218
  35. 95
  36. 396
  37. 320
  38. 389
  39. 238
  40. 68

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