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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 206 · 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. 1.58 + 58 =
  2. 2.299 + 79 =
  3. 3.132 + 39 =
  4. 4.468 + 99 =
  5. 5.370 + 58 =
  6. 6.235 + 48 =
  7. 7.176 + 89 =
  8. 8.225 + 87 =
  9. 9.162 + 69 =
  10. 10.450 + 48 =
  11. 11.217 + 49 =
  12. 12.67 + 77 =
  13. 13.432 + 67 =
  14. 14.404 + 17 =
  15. 15.55 + 48 =
  16. 16.411 + 27 =
  17. 17.284 + 88 =
  18. 18.143 + 19 =
  19. 19.38 + 98 =
  20. 20.51 + 98 =
  21. 21.263 + 77 =
  22. 22.112 + 17 =
  23. 23.391 + 37 =
  24. 24.397 + 58 =
  25. 25.54 + 67 =
  26. 26.78 + 79 =
  27. 27.167 + 37 =
  28. 28.52 + 68 =
  29. 29.373 + 77 =
  30. 30.246 + 77 =
  31. 31.105 + 39 =
  32. 32.87 + 29 =
  33. 33.491 + 77 =
  34. 34.93 + 69 =
  35. 35.293 + 38 =
  36. 36.240 + 17 =
  37. 37.338 + 28 =
  38. 38.213 + 48 =
  39. 39.315 + 47 =
  40. 40.456 + 27 =

Answer key

  1. 116
  2. 378
  3. 171
  4. 567
  5. 428
  6. 283
  7. 265
  8. 312
  9. 231
  10. 498
  11. 266
  12. 144
  13. 499
  14. 421
  15. 103
  16. 438
  17. 372
  18. 162
  19. 136
  20. 149
  21. 340
  22. 129
  23. 428
  24. 455
  25. 121
  26. 157
  27. 204
  28. 120
  29. 450
  30. 323
  31. 144
  32. 116
  33. 568
  34. 162
  35. 331
  36. 257
  37. 366
  38. 261
  39. 362
  40. 483

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