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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 713 · 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. 1.469 + 29 =
  2. 2.491 + 37 =
  3. 3.161 + 89 =
  4. 4.250 + 57 =
  5. 5.314 + 38 =
  6. 6.324 + 68 =
  7. 7.185 + 58 =
  8. 8.366 + 18 =
  9. 9.128 + 57 =
  10. 10.64 + 68 =
  11. 11.391 + 88 =
  12. 12.310 + 28 =
  13. 13.174 + 88 =
  14. 14.214 + 97 =
  15. 15.90 + 27 =
  16. 16.330 + 69 =
  17. 17.451 + 18 =
  18. 18.391 + 67 =
  19. 19.32 + 57 =
  20. 20.450 + 99 =
  21. 21.209 + 57 =
  22. 22.249 + 57 =
  23. 23.142 + 18 =
  24. 24.87 + 99 =
  25. 25.28 + 39 =
  26. 26.218 + 19 =
  27. 27.416 + 69 =
  28. 28.38 + 58 =
  29. 29.85 + 87 =
  30. 30.66 + 79 =
  31. 31.70 + 37 =
  32. 32.111 + 77 =
  33. 33.256 + 37 =
  34. 34.315 + 38 =
  35. 35.115 + 27 =
  36. 36.120 + 38 =
  37. 37.290 + 47 =
  38. 38.474 + 48 =
  39. 39.158 + 59 =
  40. 40.200 + 37 =

Answer key

  1. 498
  2. 528
  3. 250
  4. 307
  5. 352
  6. 392
  7. 243
  8. 384
  9. 185
  10. 132
  11. 479
  12. 338
  13. 262
  14. 311
  15. 117
  16. 399
  17. 469
  18. 458
  19. 89
  20. 549
  21. 266
  22. 306
  23. 160
  24. 186
  25. 67
  26. 237
  27. 485
  28. 96
  29. 172
  30. 145
  31. 107
  32. 188
  33. 293
  34. 353
  35. 142
  36. 158
  37. 337
  38. 522
  39. 217
  40. 237

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