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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 761 · 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. 1.302 + 28 =
  2. 2.284 + 69 =
  3. 3.347 + 77 =
  4. 4.218 + 98 =
  5. 5.188 + 47 =
  6. 6.497 + 59 =
  7. 7.89 + 49 =
  8. 8.242 + 59 =
  9. 9.215 + 49 =
  10. 10.95 + 19 =
  11. 11.364 + 79 =
  12. 12.174 + 78 =
  13. 13.436 + 77 =
  14. 14.301 + 99 =
  15. 15.166 + 67 =
  16. 16.490 + 88 =
  17. 17.81 + 69 =
  18. 18.143 + 39 =
  19. 19.464 + 39 =
  20. 20.263 + 77 =
  21. 21.453 + 77 =
  22. 22.28 + 17 =
  23. 23.109 + 17 =
  24. 24.221 + 48 =
  25. 25.115 + 38 =
  26. 26.470 + 27 =
  27. 27.391 + 78 =
  28. 28.242 + 68 =
  29. 29.398 + 57 =
  30. 30.393 + 39 =
  31. 31.164 + 39 =
  32. 32.307 + 58 =
  33. 33.130 + 17 =
  34. 34.472 + 88 =
  35. 35.107 + 18 =
  36. 36.350 + 79 =
  37. 37.83 + 77 =
  38. 38.324 + 98 =
  39. 39.359 + 87 =
  40. 40.451 + 28 =

Answer key

  1. 330
  2. 353
  3. 424
  4. 316
  5. 235
  6. 556
  7. 138
  8. 301
  9. 264
  10. 114
  11. 443
  12. 252
  13. 513
  14. 400
  15. 233
  16. 578
  17. 150
  18. 182
  19. 503
  20. 340
  21. 530
  22. 45
  23. 126
  24. 269
  25. 153
  26. 497
  27. 469
  28. 310
  29. 455
  30. 432
  31. 203
  32. 365
  33. 147
  34. 560
  35. 125
  36. 429
  37. 160
  38. 422
  39. 446
  40. 479

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