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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 330 · 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. 1.139 + 87 =
  2. 2.113 + 18 =
  3. 3.113 + 87 =
  4. 4.117 + 57 =
  5. 5.82 + 27 =
  6. 6.304 + 49 =
  7. 7.318 + 17 =
  8. 8.444 + 18 =
  9. 9.109 + 39 =
  10. 10.226 + 88 =
  11. 11.143 + 77 =
  12. 12.71 + 17 =
  13. 13.365 + 48 =
  14. 14.142 + 18 =
  15. 15.130 + 29 =
  16. 16.261 + 58 =
  17. 17.395 + 37 =
  18. 18.427 + 77 =
  19. 19.53 + 77 =
  20. 20.471 + 17 =
  21. 21.326 + 29 =
  22. 22.118 + 29 =
  23. 23.82 + 37 =
  24. 24.470 + 99 =
  25. 25.412 + 29 =
  26. 26.146 + 79 =
  27. 27.219 + 77 =
  28. 28.29 + 19 =
  29. 29.46 + 29 =
  30. 30.278 + 58 =
  31. 31.484 + 78 =
  32. 32.451 + 27 =
  33. 33.211 + 67 =
  34. 34.444 + 47 =
  35. 35.231 + 59 =
  36. 36.280 + 59 =
  37. 37.78 + 58 =
  38. 38.396 + 27 =
  39. 39.317 + 68 =
  40. 40.240 + 28 =

Answer key

  1. 226
  2. 131
  3. 200
  4. 174
  5. 109
  6. 353
  7. 335
  8. 462
  9. 148
  10. 314
  11. 220
  12. 88
  13. 413
  14. 160
  15. 159
  16. 319
  17. 432
  18. 504
  19. 130
  20. 488
  21. 355
  22. 147
  23. 119
  24. 569
  25. 441
  26. 225
  27. 296
  28. 48
  29. 75
  30. 336
  31. 562
  32. 478
  33. 278
  34. 491
  35. 290
  36. 339
  37. 136
  38. 423
  39. 385
  40. 268

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