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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 338 · 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. 1.57 + 38 =
  2. 2.58 + 49 =
  3. 3.142 + 37 =
  4. 4.166 + 49 =
  5. 5.130 + 77 =
  6. 6.329 + 39 =
  7. 7.363 + 18 =
  8. 8.493 + 47 =
  9. 9.97 + 77 =
  10. 10.85 + 98 =
  11. 11.483 + 29 =
  12. 12.403 + 47 =
  13. 13.62 + 19 =
  14. 14.68 + 18 =
  15. 15.417 + 99 =
  16. 16.95 + 77 =
  17. 17.358 + 79 =
  18. 18.491 + 68 =
  19. 19.262 + 78 =
  20. 20.230 + 77 =
  21. 21.347 + 37 =
  22. 22.376 + 19 =
  23. 23.297 + 39 =
  24. 24.110 + 39 =
  25. 25.492 + 17 =
  26. 26.234 + 89 =
  27. 27.204 + 48 =
  28. 28.196 + 37 =
  29. 29.116 + 88 =
  30. 30.176 + 17 =
  31. 31.86 + 27 =
  32. 32.170 + 17 =
  33. 33.289 + 98 =
  34. 34.273 + 19 =
  35. 35.362 + 99 =
  36. 36.212 + 69 =
  37. 37.77 + 17 =
  38. 38.290 + 67 =
  39. 39.302 + 39 =
  40. 40.182 + 88 =

Answer key

  1. 95
  2. 107
  3. 179
  4. 215
  5. 207
  6. 368
  7. 381
  8. 540
  9. 174
  10. 183
  11. 512
  12. 450
  13. 81
  14. 86
  15. 516
  16. 172
  17. 437
  18. 559
  19. 340
  20. 307
  21. 384
  22. 395
  23. 336
  24. 149
  25. 509
  26. 323
  27. 252
  28. 233
  29. 204
  30. 193
  31. 113
  32. 187
  33. 387
  34. 292
  35. 461
  36. 281
  37. 94
  38. 357
  39. 341
  40. 270

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