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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 665 · 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. 1.69 + 98 =
  2. 2.205 + 29 =
  3. 3.222 + 17 =
  4. 4.272 + 27 =
  5. 5.385 + 77 =
  6. 6.206 + 49 =
  7. 7.260 + 78 =
  8. 8.83 + 99 =
  9. 9.285 + 78 =
  10. 10.375 + 78 =
  11. 11.206 + 88 =
  12. 12.199 + 39 =
  13. 13.76 + 78 =
  14. 14.373 + 59 =
  15. 15.216 + 28 =
  16. 16.79 + 97 =
  17. 17.95 + 69 =
  18. 18.231 + 28 =
  19. 19.221 + 28 =
  20. 20.290 + 69 =
  21. 21.292 + 58 =
  22. 22.105 + 68 =
  23. 23.92 + 28 =
  24. 24.227 + 98 =
  25. 25.175 + 18 =
  26. 26.443 + 39 =
  27. 27.357 + 39 =
  28. 28.115 + 49 =
  29. 29.36 + 19 =
  30. 30.280 + 78 =
  31. 31.51 + 79 =
  32. 32.162 + 87 =
  33. 33.326 + 57 =
  34. 34.328 + 59 =
  35. 35.460 + 47 =
  36. 36.419 + 98 =
  37. 37.266 + 48 =
  38. 38.216 + 57 =
  39. 39.493 + 77 =
  40. 40.404 + 78 =

Answer key

  1. 167
  2. 234
  3. 239
  4. 299
  5. 462
  6. 255
  7. 338
  8. 182
  9. 363
  10. 453
  11. 294
  12. 238
  13. 154
  14. 432
  15. 244
  16. 176
  17. 164
  18. 259
  19. 249
  20. 359
  21. 350
  22. 173
  23. 120
  24. 325
  25. 193
  26. 482
  27. 396
  28. 164
  29. 55
  30. 358
  31. 130
  32. 249
  33. 383
  34. 387
  35. 507
  36. 517
  37. 314
  38. 273
  39. 570
  40. 482

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