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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 300 · 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. 1.56 + 48 =
  2. 2.128 + 19 =
  3. 3.218 + 58 =
  4. 4.420 + 37 =
  5. 5.198 + 19 =
  6. 6.150 + 57 =
  7. 7.224 + 79 =
  8. 8.115 + 28 =
  9. 9.88 + 99 =
  10. 10.391 + 39 =
  11. 11.178 + 57 =
  12. 12.281 + 47 =
  13. 13.138 + 77 =
  14. 14.350 + 48 =
  15. 15.354 + 19 =
  16. 16.96 + 18 =
  17. 17.431 + 19 =
  18. 18.400 + 67 =
  19. 19.357 + 98 =
  20. 20.113 + 68 =
  21. 21.474 + 67 =
  22. 22.290 + 29 =
  23. 23.441 + 58 =
  24. 24.491 + 37 =
  25. 25.151 + 29 =
  26. 26.288 + 27 =
  27. 27.349 + 37 =
  28. 28.291 + 38 =
  29. 29.332 + 88 =
  30. 30.123 + 28 =
  31. 31.486 + 58 =
  32. 32.425 + 77 =
  33. 33.408 + 38 =
  34. 34.31 + 68 =
  35. 35.296 + 97 =
  36. 36.298 + 89 =
  37. 37.134 + 57 =
  38. 38.299 + 38 =
  39. 39.98 + 28 =
  40. 40.260 + 79 =

Answer key

  1. 104
  2. 147
  3. 276
  4. 457
  5. 217
  6. 207
  7. 303
  8. 143
  9. 187
  10. 430
  11. 235
  12. 328
  13. 215
  14. 398
  15. 373
  16. 114
  17. 450
  18. 467
  19. 455
  20. 181
  21. 541
  22. 319
  23. 499
  24. 528
  25. 180
  26. 315
  27. 386
  28. 329
  29. 420
  30. 151
  31. 544
  32. 502
  33. 446
  34. 99
  35. 393
  36. 387
  37. 191
  38. 337
  39. 126
  40. 339

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