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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 27 · 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. 1.128 + 88 =
  2. 2.120 + 57 =
  3. 3.109 + 17 =
  4. 4.190 + 58 =
  5. 5.137 + 47 =
  6. 6.67 + 57 =
  7. 7.282 + 38 =
  8. 8.137 + 17 =
  9. 9.101 + 28 =
  10. 10.198 + 67 =
  11. 11.67 + 48 =
  12. 12.73 + 89 =
  13. 13.50 + 47 =
  14. 14.499 + 37 =
  15. 15.332 + 47 =
  16. 16.263 + 98 =
  17. 17.177 + 89 =
  18. 18.46 + 18 =
  19. 19.303 + 78 =
  20. 20.465 + 88 =
  21. 21.41 + 77 =
  22. 22.208 + 27 =
  23. 23.204 + 17 =
  24. 24.65 + 77 =
  25. 25.162 + 88 =
  26. 26.388 + 79 =
  27. 27.48 + 57 =
  28. 28.392 + 17 =
  29. 29.44 + 87 =
  30. 30.406 + 77 =
  31. 31.178 + 77 =
  32. 32.243 + 57 =
  33. 33.436 + 19 =
  34. 34.93 + 18 =
  35. 35.246 + 97 =
  36. 36.347 + 27 =
  37. 37.94 + 77 =
  38. 38.31 + 58 =
  39. 39.322 + 28 =
  40. 40.41 + 17 =

Answer key

  1. 216
  2. 177
  3. 126
  4. 248
  5. 184
  6. 124
  7. 320
  8. 154
  9. 129
  10. 265
  11. 115
  12. 162
  13. 97
  14. 536
  15. 379
  16. 361
  17. 266
  18. 64
  19. 381
  20. 553
  21. 118
  22. 235
  23. 221
  24. 142
  25. 250
  26. 467
  27. 105
  28. 409
  29. 131
  30. 483
  31. 255
  32. 300
  33. 455
  34. 111
  35. 343
  36. 374
  37. 171
  38. 89
  39. 350
  40. 58

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