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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 94 · 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. 1.281 + 59 =
  2. 2.429 + 18 =
  3. 3.377 + 38 =
  4. 4.336 + 88 =
  5. 5.334 + 29 =
  6. 6.48 + 27 =
  7. 7.213 + 87 =
  8. 8.464 + 87 =
  9. 9.113 + 39 =
  10. 10.313 + 37 =
  11. 11.257 + 99 =
  12. 12.355 + 27 =
  13. 13.44 + 79 =
  14. 14.177 + 19 =
  15. 15.111 + 29 =
  16. 16.308 + 97 =
  17. 17.110 + 59 =
  18. 18.337 + 49 =
  19. 19.319 + 78 =
  20. 20.135 + 77 =
  21. 21.41 + 58 =
  22. 22.294 + 18 =
  23. 23.460 + 97 =
  24. 24.485 + 19 =
  25. 25.449 + 18 =
  26. 26.173 + 87 =
  27. 27.495 + 87 =
  28. 28.70 + 89 =
  29. 29.36 + 27 =
  30. 30.219 + 97 =
  31. 31.247 + 29 =
  32. 32.93 + 99 =
  33. 33.172 + 28 =
  34. 34.73 + 79 =
  35. 35.385 + 18 =
  36. 36.218 + 68 =
  37. 37.336 + 38 =
  38. 38.181 + 77 =
  39. 39.123 + 38 =
  40. 40.335 + 18 =

Answer key

  1. 340
  2. 447
  3. 415
  4. 424
  5. 363
  6. 75
  7. 300
  8. 551
  9. 152
  10. 350
  11. 356
  12. 382
  13. 123
  14. 196
  15. 140
  16. 405
  17. 169
  18. 386
  19. 397
  20. 212
  21. 99
  22. 312
  23. 557
  24. 504
  25. 467
  26. 260
  27. 582
  28. 159
  29. 63
  30. 316
  31. 276
  32. 192
  33. 200
  34. 152
  35. 403
  36. 286
  37. 374
  38. 258
  39. 161
  40. 353

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