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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 90 · 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. 1.410 + 98 =
  2. 2.322 + 49 =
  3. 3.439 + 99 =
  4. 4.38 + 17 =
  5. 5.121 + 88 =
  6. 6.304 + 17 =
  7. 7.478 + 58 =
  8. 8.245 + 57 =
  9. 9.490 + 28 =
  10. 10.399 + 99 =
  11. 11.163 + 47 =
  12. 12.82 + 49 =
  13. 13.481 + 89 =
  14. 14.405 + 27 =
  15. 15.427 + 77 =
  16. 16.157 + 79 =
  17. 17.381 + 58 =
  18. 18.169 + 29 =
  19. 19.304 + 17 =
  20. 20.86 + 27 =
  21. 21.125 + 27 =
  22. 22.426 + 98 =
  23. 23.250 + 39 =
  24. 24.34 + 17 =
  25. 25.34 + 48 =
  26. 26.94 + 77 =
  27. 27.108 + 29 =
  28. 28.343 + 39 =
  29. 29.152 + 78 =
  30. 30.61 + 98 =
  31. 31.74 + 78 =
  32. 32.479 + 28 =
  33. 33.490 + 77 =
  34. 34.25 + 27 =
  35. 35.52 + 19 =
  36. 36.338 + 78 =
  37. 37.112 + 39 =
  38. 38.406 + 98 =
  39. 39.303 + 49 =
  40. 40.359 + 87 =

Answer key

  1. 508
  2. 371
  3. 538
  4. 55
  5. 209
  6. 321
  7. 536
  8. 302
  9. 518
  10. 498
  11. 210
  12. 131
  13. 570
  14. 432
  15. 504
  16. 236
  17. 439
  18. 198
  19. 321
  20. 113
  21. 152
  22. 524
  23. 289
  24. 51
  25. 82
  26. 171
  27. 137
  28. 382
  29. 230
  30. 159
  31. 152
  32. 507
  33. 567
  34. 52
  35. 71
  36. 416
  37. 151
  38. 504
  39. 352
  40. 446

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