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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 504 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.114 + 69 =
  2. 2.56 + 68 =
  3. 3.113 + 47 =
  4. 4.300 + 58 =
  5. 5.448 + 47 =
  6. 6.289 + 47 =
  7. 7.204 + 57 =
  8. 8.59 + 17 =
  9. 9.106 + 17 =
  10. 10.445 + 87 =
  11. 11.439 + 48 =
  12. 12.87 + 98 =
  13. 13.64 + 58 =
  14. 14.465 + 29 =
  15. 15.40 + 98 =
  16. 16.108 + 47 =
  17. 17.156 + 89 =
  18. 18.444 + 48 =
  19. 19.57 + 37 =
  20. 20.226 + 57 =
  21. 21.74 + 88 =
  22. 22.159 + 49 =
  23. 23.85 + 29 =
  24. 24.251 + 17 =
  25. 25.360 + 89 =
  26. 26.331 + 17 =
  27. 27.333 + 77 =
  28. 28.437 + 37 =
  29. 29.167 + 28 =
  30. 30.437 + 87 =
  31. 31.383 + 78 =
  32. 32.216 + 97 =
  33. 33.359 + 77 =
  34. 34.493 + 97 =
  35. 35.147 + 27 =
  36. 36.396 + 99 =
  37. 37.365 + 87 =
  38. 38.423 + 89 =
  39. 39.238 + 17 =
  40. 40.411 + 89 =

Answer key

  1. 183
  2. 124
  3. 160
  4. 358
  5. 495
  6. 336
  7. 261
  8. 76
  9. 123
  10. 532
  11. 487
  12. 185
  13. 122
  14. 494
  15. 138
  16. 155
  17. 245
  18. 492
  19. 94
  20. 283
  21. 162
  22. 208
  23. 114
  24. 268
  25. 449
  26. 348
  27. 410
  28. 474
  29. 195
  30. 524
  31. 461
  32. 313
  33. 436
  34. 590
  35. 174
  36. 495
  37. 452
  38. 512
  39. 255
  40. 500

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