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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 661 · 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. 1.130 + 29 =
  2. 2.421 + 28 =
  3. 3.348 + 37 =
  4. 4.328 + 68 =
  5. 5.288 + 29 =
  6. 6.460 + 27 =
  7. 7.44 + 19 =
  8. 8.303 + 19 =
  9. 9.303 + 79 =
  10. 10.27 + 49 =
  11. 11.343 + 99 =
  12. 12.329 + 18 =
  13. 13.481 + 87 =
  14. 14.234 + 98 =
  15. 15.241 + 18 =
  16. 16.44 + 27 =
  17. 17.281 + 69 =
  18. 18.217 + 19 =
  19. 19.49 + 17 =
  20. 20.153 + 67 =
  21. 21.46 + 68 =
  22. 22.67 + 48 =
  23. 23.244 + 29 =
  24. 24.296 + 17 =
  25. 25.472 + 79 =
  26. 26.91 + 39 =
  27. 27.436 + 47 =
  28. 28.434 + 87 =
  29. 29.47 + 47 =
  30. 30.251 + 77 =
  31. 31.126 + 69 =
  32. 32.267 + 29 =
  33. 33.126 + 27 =
  34. 34.395 + 47 =
  35. 35.43 + 78 =
  36. 36.163 + 88 =
  37. 37.87 + 79 =
  38. 38.108 + 27 =
  39. 39.241 + 29 =
  40. 40.212 + 37 =

Answer key

  1. 159
  2. 449
  3. 385
  4. 396
  5. 317
  6. 487
  7. 63
  8. 322
  9. 382
  10. 76
  11. 442
  12. 347
  13. 568
  14. 332
  15. 259
  16. 71
  17. 350
  18. 236
  19. 66
  20. 220
  21. 114
  22. 115
  23. 273
  24. 313
  25. 551
  26. 130
  27. 483
  28. 521
  29. 94
  30. 328
  31. 195
  32. 296
  33. 153
  34. 442
  35. 121
  36. 251
  37. 166
  38. 135
  39. 270
  40. 249

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