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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 689 · 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. 1.464 + 19 =
  2. 2.275 + 58 =
  3. 3.49 + 58 =
  4. 4.229 + 37 =
  5. 5.66 + 68 =
  6. 6.26 + 87 =
  7. 7.68 + 79 =
  8. 8.486 + 57 =
  9. 9.484 + 37 =
  10. 10.164 + 48 =
  11. 11.45 + 27 =
  12. 12.82 + 29 =
  13. 13.320 + 59 =
  14. 14.493 + 59 =
  15. 15.492 + 37 =
  16. 16.285 + 68 =
  17. 17.364 + 37 =
  18. 18.352 + 27 =
  19. 19.150 + 38 =
  20. 20.284 + 79 =
  21. 21.187 + 69 =
  22. 22.429 + 47 =
  23. 23.363 + 37 =
  24. 24.103 + 87 =
  25. 25.447 + 47 =
  26. 26.69 + 99 =
  27. 27.363 + 98 =
  28. 28.397 + 87 =
  29. 29.407 + 18 =
  30. 30.326 + 77 =
  31. 31.189 + 69 =
  32. 32.99 + 89 =
  33. 33.430 + 28 =
  34. 34.272 + 39 =
  35. 35.290 + 28 =
  36. 36.195 + 99 =
  37. 37.470 + 27 =
  38. 38.382 + 98 =
  39. 39.262 + 78 =
  40. 40.461 + 19 =

Answer key

  1. 483
  2. 333
  3. 107
  4. 266
  5. 134
  6. 113
  7. 147
  8. 543
  9. 521
  10. 212
  11. 72
  12. 111
  13. 379
  14. 552
  15. 529
  16. 353
  17. 401
  18. 379
  19. 188
  20. 363
  21. 256
  22. 476
  23. 400
  24. 190
  25. 494
  26. 168
  27. 461
  28. 484
  29. 425
  30. 403
  31. 258
  32. 188
  33. 458
  34. 311
  35. 318
  36. 294
  37. 497
  38. 480
  39. 340
  40. 480

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