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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 353 · 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. 1.480 + 17 =
  2. 2.476 + 99 =
  3. 3.468 + 27 =
  4. 4.439 + 39 =
  5. 5.491 + 79 =
  6. 6.414 + 18 =
  7. 7.318 + 18 =
  8. 8.346 + 49 =
  9. 9.248 + 17 =
  10. 10.331 + 79 =
  11. 11.279 + 67 =
  12. 12.202 + 29 =
  13. 13.325 + 37 =
  14. 14.163 + 97 =
  15. 15.428 + 87 =
  16. 16.123 + 48 =
  17. 17.51 + 57 =
  18. 18.71 + 37 =
  19. 19.287 + 89 =
  20. 20.130 + 38 =
  21. 21.142 + 17 =
  22. 22.75 + 17 =
  23. 23.139 + 87 =
  24. 24.122 + 98 =
  25. 25.80 + 98 =
  26. 26.143 + 67 =
  27. 27.411 + 49 =
  28. 28.145 + 99 =
  29. 29.278 + 37 =
  30. 30.90 + 69 =
  31. 31.141 + 18 =
  32. 32.95 + 59 =
  33. 33.136 + 69 =
  34. 34.57 + 38 =
  35. 35.229 + 39 =
  36. 36.159 + 37 =
  37. 37.343 + 89 =
  38. 38.123 + 58 =
  39. 39.96 + 47 =
  40. 40.491 + 59 =

Answer key

  1. 497
  2. 575
  3. 495
  4. 478
  5. 570
  6. 432
  7. 336
  8. 395
  9. 265
  10. 410
  11. 346
  12. 231
  13. 362
  14. 260
  15. 515
  16. 171
  17. 108
  18. 108
  19. 376
  20. 168
  21. 159
  22. 92
  23. 226
  24. 220
  25. 178
  26. 210
  27. 460
  28. 244
  29. 315
  30. 159
  31. 159
  32. 154
  33. 205
  34. 95
  35. 268
  36. 196
  37. 432
  38. 181
  39. 143
  40. 550

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