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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 563 · 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. 1.317 + 98 =
  2. 2.364 + 37 =
  3. 3.309 + 68 =
  4. 4.352 + 88 =
  5. 5.120 + 18 =
  6. 6.275 + 99 =
  7. 7.224 + 87 =
  8. 8.79 + 99 =
  9. 9.138 + 28 =
  10. 10.438 + 39 =
  11. 11.254 + 27 =
  12. 12.334 + 47 =
  13. 13.401 + 57 =
  14. 14.115 + 58 =
  15. 15.497 + 48 =
  16. 16.94 + 79 =
  17. 17.163 + 88 =
  18. 18.498 + 48 =
  19. 19.222 + 37 =
  20. 20.26 + 18 =
  21. 21.361 + 19 =
  22. 22.239 + 27 =
  23. 23.408 + 67 =
  24. 24.61 + 19 =
  25. 25.183 + 17 =
  26. 26.476 + 68 =
  27. 27.243 + 18 =
  28. 28.422 + 19 =
  29. 29.111 + 97 =
  30. 30.195 + 69 =
  31. 31.131 + 69 =
  32. 32.220 + 19 =
  33. 33.30 + 37 =
  34. 34.43 + 77 =
  35. 35.162 + 97 =
  36. 36.282 + 17 =
  37. 37.37 + 27 =
  38. 38.387 + 87 =
  39. 39.165 + 87 =
  40. 40.55 + 97 =

Answer key

  1. 415
  2. 401
  3. 377
  4. 440
  5. 138
  6. 374
  7. 311
  8. 178
  9. 166
  10. 477
  11. 281
  12. 381
  13. 458
  14. 173
  15. 545
  16. 173
  17. 251
  18. 546
  19. 259
  20. 44
  21. 380
  22. 266
  23. 475
  24. 80
  25. 200
  26. 544
  27. 261
  28. 441
  29. 208
  30. 264
  31. 200
  32. 239
  33. 67
  34. 120
  35. 259
  36. 299
  37. 64
  38. 474
  39. 252
  40. 152

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