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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 160 · 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. 1.200 + 17 =
  2. 2.383 + 28 =
  3. 3.368 + 38 =
  4. 4.298 + 49 =
  5. 5.299 + 58 =
  6. 6.496 + 97 =
  7. 7.415 + 98 =
  8. 8.317 + 57 =
  9. 9.485 + 39 =
  10. 10.208 + 79 =
  11. 11.112 + 38 =
  12. 12.89 + 27 =
  13. 13.289 + 59 =
  14. 14.91 + 49 =
  15. 15.56 + 37 =
  16. 16.195 + 79 =
  17. 17.392 + 27 =
  18. 18.437 + 97 =
  19. 19.99 + 99 =
  20. 20.484 + 68 =
  21. 21.258 + 97 =
  22. 22.224 + 28 =
  23. 23.414 + 57 =
  24. 24.485 + 87 =
  25. 25.406 + 59 =
  26. 26.352 + 27 =
  27. 27.225 + 47 =
  28. 28.214 + 48 =
  29. 29.147 + 39 =
  30. 30.56 + 17 =
  31. 31.111 + 37 =
  32. 32.50 + 79 =
  33. 33.269 + 29 =
  34. 34.246 + 18 =
  35. 35.439 + 87 =
  36. 36.130 + 47 =
  37. 37.379 + 99 =
  38. 38.84 + 17 =
  39. 39.63 + 47 =
  40. 40.132 + 47 =

Answer key

  1. 217
  2. 411
  3. 406
  4. 347
  5. 357
  6. 593
  7. 513
  8. 374
  9. 524
  10. 287
  11. 150
  12. 116
  13. 348
  14. 140
  15. 93
  16. 274
  17. 419
  18. 534
  19. 198
  20. 552
  21. 355
  22. 252
  23. 471
  24. 572
  25. 465
  26. 379
  27. 272
  28. 262
  29. 186
  30. 73
  31. 148
  32. 129
  33. 298
  34. 264
  35. 526
  36. 177
  37. 478
  38. 101
  39. 110
  40. 179

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