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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 270 · 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. 1.211 + 69 =
  2. 2.443 + 68 =
  3. 3.240 + 59 =
  4. 4.342 + 49 =
  5. 5.362 + 87 =
  6. 6.424 + 48 =
  7. 7.426 + 87 =
  8. 8.49 + 47 =
  9. 9.389 + 98 =
  10. 10.244 + 58 =
  11. 11.164 + 39 =
  12. 12.301 + 47 =
  13. 13.412 + 47 =
  14. 14.161 + 58 =
  15. 15.168 + 87 =
  16. 16.53 + 78 =
  17. 17.450 + 67 =
  18. 18.113 + 87 =
  19. 19.215 + 58 =
  20. 20.222 + 97 =
  21. 21.387 + 39 =
  22. 22.322 + 27 =
  23. 23.115 + 28 =
  24. 24.153 + 99 =
  25. 25.360 + 49 =
  26. 26.369 + 17 =
  27. 27.279 + 69 =
  28. 28.491 + 69 =
  29. 29.455 + 87 =
  30. 30.320 + 29 =
  31. 31.302 + 97 =
  32. 32.248 + 78 =
  33. 33.403 + 67 =
  34. 34.147 + 88 =
  35. 35.246 + 58 =
  36. 36.322 + 28 =
  37. 37.61 + 48 =
  38. 38.448 + 69 =
  39. 39.147 + 68 =
  40. 40.287 + 87 =

Answer key

  1. 280
  2. 511
  3. 299
  4. 391
  5. 449
  6. 472
  7. 513
  8. 96
  9. 487
  10. 302
  11. 203
  12. 348
  13. 459
  14. 219
  15. 255
  16. 131
  17. 517
  18. 200
  19. 273
  20. 319
  21. 426
  22. 349
  23. 143
  24. 252
  25. 409
  26. 386
  27. 348
  28. 560
  29. 542
  30. 349
  31. 399
  32. 326
  33. 470
  34. 235
  35. 304
  36. 350
  37. 109
  38. 517
  39. 215
  40. 374

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