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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 137 · 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. 1.307 + 58 =
  2. 2.96 + 29 =
  3. 3.471 + 18 =
  4. 4.363 + 47 =
  5. 5.304 + 47 =
  6. 6.444 + 29 =
  7. 7.324 + 27 =
  8. 8.322 + 17 =
  9. 9.371 + 17 =
  10. 10.125 + 47 =
  11. 11.456 + 89 =
  12. 12.238 + 99 =
  13. 13.316 + 69 =
  14. 14.32 + 58 =
  15. 15.149 + 69 =
  16. 16.131 + 69 =
  17. 17.294 + 78 =
  18. 18.332 + 99 =
  19. 19.397 + 38 =
  20. 20.306 + 17 =
  21. 21.102 + 59 =
  22. 22.365 + 17 =
  23. 23.308 + 59 =
  24. 24.481 + 29 =
  25. 25.74 + 77 =
  26. 26.27 + 19 =
  27. 27.77 + 78 =
  28. 28.266 + 68 =
  29. 29.27 + 49 =
  30. 30.103 + 57 =
  31. 31.231 + 97 =
  32. 32.216 + 78 =
  33. 33.194 + 37 =
  34. 34.370 + 27 =
  35. 35.66 + 58 =
  36. 36.58 + 77 =
  37. 37.41 + 79 =
  38. 38.50 + 37 =
  39. 39.119 + 78 =
  40. 40.423 + 47 =

Answer key

  1. 365
  2. 125
  3. 489
  4. 410
  5. 351
  6. 473
  7. 351
  8. 339
  9. 388
  10. 172
  11. 545
  12. 337
  13. 385
  14. 90
  15. 218
  16. 200
  17. 372
  18. 431
  19. 435
  20. 323
  21. 161
  22. 382
  23. 367
  24. 510
  25. 151
  26. 46
  27. 155
  28. 334
  29. 76
  30. 160
  31. 328
  32. 294
  33. 231
  34. 397
  35. 124
  36. 135
  37. 120
  38. 87
  39. 197
  40. 470

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