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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 461 · 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. 1.353 + 59 =
  2. 2.119 + 39 =
  3. 3.151 + 77 =
  4. 4.280 + 48 =
  5. 5.282 + 58 =
  6. 6.339 + 17 =
  7. 7.371 + 48 =
  8. 8.353 + 58 =
  9. 9.183 + 58 =
  10. 10.320 + 18 =
  11. 11.186 + 58 =
  12. 12.131 + 97 =
  13. 13.59 + 28 =
  14. 14.243 + 58 =
  15. 15.78 + 29 =
  16. 16.71 + 68 =
  17. 17.416 + 68 =
  18. 18.262 + 17 =
  19. 19.264 + 98 =
  20. 20.345 + 79 =
  21. 21.387 + 89 =
  22. 22.405 + 69 =
  23. 23.159 + 48 =
  24. 24.147 + 28 =
  25. 25.328 + 38 =
  26. 26.394 + 27 =
  27. 27.330 + 88 =
  28. 28.276 + 57 =
  29. 29.406 + 99 =
  30. 30.54 + 27 =
  31. 31.435 + 27 =
  32. 32.347 + 59 =
  33. 33.188 + 77 =
  34. 34.478 + 97 =
  35. 35.499 + 79 =
  36. 36.426 + 49 =
  37. 37.85 + 78 =
  38. 38.393 + 59 =
  39. 39.440 + 48 =
  40. 40.280 + 18 =

Answer key

  1. 412
  2. 158
  3. 228
  4. 328
  5. 340
  6. 356
  7. 419
  8. 411
  9. 241
  10. 338
  11. 244
  12. 228
  13. 87
  14. 301
  15. 107
  16. 139
  17. 484
  18. 279
  19. 362
  20. 424
  21. 476
  22. 474
  23. 207
  24. 175
  25. 366
  26. 421
  27. 418
  28. 333
  29. 505
  30. 81
  31. 462
  32. 406
  33. 265
  34. 575
  35. 578
  36. 475
  37. 163
  38. 452
  39. 488
  40. 298

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