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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 755 · 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. 1.205 + 28 =
  2. 2.108 + 59 =
  3. 3.475 + 69 =
  4. 4.382 + 59 =
  5. 5.244 + 78 =
  6. 6.82 + 49 =
  7. 7.262 + 48 =
  8. 8.137 + 67 =
  9. 9.127 + 49 =
  10. 10.195 + 87 =
  11. 11.30 + 18 =
  12. 12.58 + 29 =
  13. 13.221 + 67 =
  14. 14.340 + 77 =
  15. 15.239 + 47 =
  16. 16.413 + 68 =
  17. 17.84 + 89 =
  18. 18.315 + 97 =
  19. 19.53 + 18 =
  20. 20.243 + 69 =
  21. 21.221 + 37 =
  22. 22.292 + 29 =
  23. 23.199 + 89 =
  24. 24.314 + 37 =
  25. 25.457 + 39 =
  26. 26.467 + 58 =
  27. 27.125 + 87 =
  28. 28.396 + 97 =
  29. 29.70 + 77 =
  30. 30.79 + 37 =
  31. 31.186 + 68 =
  32. 32.61 + 58 =
  33. 33.217 + 89 =
  34. 34.259 + 99 =
  35. 35.440 + 48 =
  36. 36.37 + 38 =
  37. 37.482 + 27 =
  38. 38.43 + 28 =
  39. 39.449 + 18 =
  40. 40.45 + 99 =

Answer key

  1. 233
  2. 167
  3. 544
  4. 441
  5. 322
  6. 131
  7. 310
  8. 204
  9. 176
  10. 282
  11. 48
  12. 87
  13. 288
  14. 417
  15. 286
  16. 481
  17. 173
  18. 412
  19. 71
  20. 312
  21. 258
  22. 321
  23. 288
  24. 351
  25. 496
  26. 525
  27. 212
  28. 493
  29. 147
  30. 116
  31. 254
  32. 119
  33. 306
  34. 358
  35. 488
  36. 75
  37. 509
  38. 71
  39. 467
  40. 144

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