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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 653 · 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. 1.143 + 99 =
  2. 2.158 + 17 =
  3. 3.480 + 79 =
  4. 4.481 + 87 =
  5. 5.371 + 87 =
  6. 6.244 + 19 =
  7. 7.273 + 37 =
  8. 8.387 + 87 =
  9. 9.248 + 48 =
  10. 10.110 + 87 =
  11. 11.166 + 79 =
  12. 12.375 + 18 =
  13. 13.101 + 79 =
  14. 14.175 + 39 =
  15. 15.301 + 49 =
  16. 16.198 + 68 =
  17. 17.483 + 59 =
  18. 18.186 + 68 =
  19. 19.327 + 37 =
  20. 20.106 + 17 =
  21. 21.110 + 59 =
  22. 22.112 + 69 =
  23. 23.339 + 37 =
  24. 24.319 + 87 =
  25. 25.25 + 58 =
  26. 26.91 + 17 =
  27. 27.130 + 69 =
  28. 28.405 + 37 =
  29. 29.27 + 79 =
  30. 30.220 + 48 =
  31. 31.275 + 99 =
  32. 32.472 + 17 =
  33. 33.171 + 79 =
  34. 34.157 + 79 =
  35. 35.163 + 68 =
  36. 36.71 + 97 =
  37. 37.64 + 69 =
  38. 38.255 + 68 =
  39. 39.487 + 98 =
  40. 40.113 + 27 =

Answer key

  1. 242
  2. 175
  3. 559
  4. 568
  5. 458
  6. 263
  7. 310
  8. 474
  9. 296
  10. 197
  11. 245
  12. 393
  13. 180
  14. 214
  15. 350
  16. 266
  17. 542
  18. 254
  19. 364
  20. 123
  21. 169
  22. 181
  23. 376
  24. 406
  25. 83
  26. 108
  27. 199
  28. 442
  29. 106
  30. 268
  31. 374
  32. 489
  33. 250
  34. 236
  35. 231
  36. 168
  37. 133
  38. 323
  39. 585
  40. 140

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