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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 756 · 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. 1.265 + 98 =
  2. 2.453 + 68 =
  3. 3.68 + 37 =
  4. 4.314 + 18 =
  5. 5.72 + 37 =
  6. 6.454 + 59 =
  7. 7.406 + 37 =
  8. 8.51 + 77 =
  9. 9.356 + 67 =
  10. 10.383 + 98 =
  11. 11.485 + 98 =
  12. 12.152 + 38 =
  13. 13.199 + 87 =
  14. 14.259 + 18 =
  15. 15.58 + 49 =
  16. 16.75 + 19 =
  17. 17.149 + 99 =
  18. 18.175 + 78 =
  19. 19.118 + 47 =
  20. 20.156 + 17 =
  21. 21.385 + 67 =
  22. 22.196 + 48 =
  23. 23.118 + 19 =
  24. 24.392 + 18 =
  25. 25.87 + 37 =
  26. 26.262 + 29 =
  27. 27.56 + 49 =
  28. 28.327 + 99 =
  29. 29.322 + 19 =
  30. 30.457 + 98 =
  31. 31.116 + 59 =
  32. 32.497 + 37 =
  33. 33.329 + 17 =
  34. 34.428 + 89 =
  35. 35.395 + 37 =
  36. 36.37 + 59 =
  37. 37.296 + 48 =
  38. 38.63 + 77 =
  39. 39.235 + 57 =
  40. 40.140 + 78 =

Answer key

  1. 363
  2. 521
  3. 105
  4. 332
  5. 109
  6. 513
  7. 443
  8. 128
  9. 423
  10. 481
  11. 583
  12. 190
  13. 286
  14. 277
  15. 107
  16. 94
  17. 248
  18. 253
  19. 165
  20. 173
  21. 452
  22. 244
  23. 137
  24. 410
  25. 124
  26. 291
  27. 105
  28. 426
  29. 341
  30. 555
  31. 175
  32. 534
  33. 346
  34. 517
  35. 432
  36. 96
  37. 344
  38. 140
  39. 292
  40. 218

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