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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 869 · 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. 1.516 − 27 =
  2. 2.84 − 19 =
  3. 3.77 − 56 =
  4. 4.425 − 27 =
  5. 5.383 − 27 =
  6. 6.167 − 36 =
  7. 7.174 − 18 =
  8. 8.582 − 88 =
  9. 9.182 − 29 =
  10. 10.154 − 68 =
  11. 11.139 − 89 =
  12. 12.201 − 17 =
  13. 13.141 − 68 =
  14. 14.228 − 56 =
  15. 15.63 − 47 =
  16. 16.541 − 86 =
  17. 17.518 − 68 =
  18. 18.139 − 98 =
  19. 19.187 − 76 =
  20. 20.159 − 36 =
  21. 21.416 − 99 =
  22. 22.130 − 48 =
  23. 23.244 − 29 =
  24. 24.229 − 27 =
  25. 25.128 − 96 =
  26. 26.581 − 48 =
  27. 27.120 − 87 =
  28. 28.570 − 56 =
  29. 29.503 − 76 =
  30. 30.426 − 86 =
  31. 31.338 − 18 =
  32. 32.198 − 66 =
  33. 33.117 − 86 =
  34. 34.505 − 87 =
  35. 35.163 − 26 =
  36. 36.143 − 36 =
  37. 37.161 − 19 =
  38. 38.427 − 36 =
  39. 39.89 − 18 =
  40. 40.112 − 96 =

Answer key

  1. 489
  2. 65
  3. 21
  4. 398
  5. 356
  6. 131
  7. 156
  8. 494
  9. 153
  10. 86
  11. 50
  12. 184
  13. 73
  14. 172
  15. 16
  16. 455
  17. 450
  18. 41
  19. 111
  20. 123
  21. 317
  22. 82
  23. 215
  24. 202
  25. 32
  26. 533
  27. 33
  28. 514
  29. 427
  30. 340
  31. 320
  32. 132
  33. 31
  34. 418
  35. 137
  36. 107
  37. 142
  38. 391
  39. 71
  40. 16

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