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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 482 · 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. 1.208 + 57 =
  2. 2.457 + 98 =
  3. 3.272 + 69 =
  4. 4.122 + 98 =
  5. 5.282 + 88 =
  6. 6.110 + 18 =
  7. 7.220 + 37 =
  8. 8.468 + 68 =
  9. 9.93 + 98 =
  10. 10.352 + 27 =
  11. 11.143 + 17 =
  12. 12.232 + 47 =
  13. 13.44 + 67 =
  14. 14.434 + 18 =
  15. 15.186 + 99 =
  16. 16.244 + 79 =
  17. 17.41 + 78 =
  18. 18.329 + 87 =
  19. 19.62 + 49 =
  20. 20.338 + 57 =
  21. 21.222 + 77 =
  22. 22.142 + 49 =
  23. 23.144 + 97 =
  24. 24.243 + 47 =
  25. 25.296 + 69 =
  26. 26.150 + 58 =
  27. 27.347 + 67 =
  28. 28.81 + 57 =
  29. 29.131 + 28 =
  30. 30.224 + 58 =
  31. 31.250 + 78 =
  32. 32.218 + 37 =
  33. 33.149 + 18 =
  34. 34.165 + 19 =
  35. 35.100 + 87 =
  36. 36.406 + 98 =
  37. 37.434 + 89 =
  38. 38.179 + 87 =
  39. 39.75 + 98 =
  40. 40.455 + 37 =

Answer key

  1. 265
  2. 555
  3. 341
  4. 220
  5. 370
  6. 128
  7. 257
  8. 536
  9. 191
  10. 379
  11. 160
  12. 279
  13. 111
  14. 452
  15. 285
  16. 323
  17. 119
  18. 416
  19. 111
  20. 395
  21. 299
  22. 191
  23. 241
  24. 290
  25. 365
  26. 208
  27. 414
  28. 138
  29. 159
  30. 282
  31. 328
  32. 255
  33. 167
  34. 184
  35. 187
  36. 504
  37. 523
  38. 266
  39. 173
  40. 492

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