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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 906 · 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. 1.132 − 57 =
  2. 2.529 − 86 =
  3. 3.571 − 39 =
  4. 4.157 − 18 =
  5. 5.568 − 37 =
  6. 6.284 − 38 =
  7. 7.328 − 88 =
  8. 8.368 − 27 =
  9. 9.121 − 28 =
  10. 10.233 − 88 =
  11. 11.199 − 38 =
  12. 12.313 − 38 =
  13. 13.210 − 26 =
  14. 14.120 − 16 =
  15. 15.461 − 38 =
  16. 16.62 − 18 =
  17. 17.70 − 67 =
  18. 18.73 − 16 =
  19. 19.314 − 28 =
  20. 20.165 − 28 =
  21. 21.570 − 59 =
  22. 22.435 − 68 =
  23. 23.152 − 76 =
  24. 24.135 − 49 =
  25. 25.431 − 46 =
  26. 26.427 − 97 =
  27. 27.207 − 36 =
  28. 28.197 − 27 =
  29. 29.378 − 77 =
  30. 30.472 − 19 =
  31. 31.179 − 18 =
  32. 32.434 − 89 =
  33. 33.153 − 46 =
  34. 34.534 − 58 =
  35. 35.103 − 17 =
  36. 36.165 − 78 =
  37. 37.386 − 88 =
  38. 38.173 − 98 =
  39. 39.316 − 58 =
  40. 40.469 − 26 =

Answer key

  1. 75
  2. 443
  3. 532
  4. 139
  5. 531
  6. 246
  7. 240
  8. 341
  9. 93
  10. 145
  11. 161
  12. 275
  13. 184
  14. 104
  15. 423
  16. 44
  17. 3
  18. 57
  19. 286
  20. 137
  21. 511
  22. 367
  23. 76
  24. 86
  25. 385
  26. 330
  27. 171
  28. 170
  29. 301
  30. 453
  31. 161
  32. 345
  33. 107
  34. 476
  35. 86
  36. 87
  37. 298
  38. 75
  39. 258
  40. 443

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