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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 357 · 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. 1.48 + 87 =
  2. 2.79 + 99 =
  3. 3.105 + 18 =
  4. 4.159 + 98 =
  5. 5.132 + 37 =
  6. 6.347 + 98 =
  7. 7.408 + 47 =
  8. 8.106 + 28 =
  9. 9.204 + 67 =
  10. 10.214 + 17 =
  11. 11.472 + 47 =
  12. 12.48 + 98 =
  13. 13.146 + 28 =
  14. 14.440 + 18 =
  15. 15.37 + 27 =
  16. 16.449 + 97 =
  17. 17.472 + 49 =
  18. 18.219 + 57 =
  19. 19.448 + 78 =
  20. 20.132 + 28 =
  21. 21.406 + 19 =
  22. 22.342 + 87 =
  23. 23.52 + 37 =
  24. 24.365 + 38 =
  25. 25.91 + 38 =
  26. 26.189 + 28 =
  27. 27.37 + 37 =
  28. 28.444 + 47 =
  29. 29.54 + 78 =
  30. 30.26 + 87 =
  31. 31.84 + 78 =
  32. 32.401 + 57 =
  33. 33.188 + 89 =
  34. 34.391 + 17 =
  35. 35.485 + 39 =
  36. 36.147 + 88 =
  37. 37.356 + 59 =
  38. 38.443 + 38 =
  39. 39.388 + 79 =
  40. 40.95 + 39 =

Answer key

  1. 135
  2. 178
  3. 123
  4. 257
  5. 169
  6. 445
  7. 455
  8. 134
  9. 271
  10. 231
  11. 519
  12. 146
  13. 174
  14. 458
  15. 64
  16. 546
  17. 521
  18. 276
  19. 526
  20. 160
  21. 425
  22. 429
  23. 89
  24. 403
  25. 129
  26. 217
  27. 74
  28. 491
  29. 132
  30. 113
  31. 162
  32. 458
  33. 277
  34. 408
  35. 524
  36. 235
  37. 415
  38. 481
  39. 467
  40. 134

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