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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 815 · 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. 1.357 + 27 =
  2. 2.127 + 19 =
  3. 3.276 + 69 =
  4. 4.34 + 78 =
  5. 5.376 + 99 =
  6. 6.398 + 49 =
  7. 7.187 + 87 =
  8. 8.389 + 87 =
  9. 9.50 + 58 =
  10. 10.491 + 37 =
  11. 11.433 + 17 =
  12. 12.49 + 78 =
  13. 13.61 + 79 =
  14. 14.397 + 57 =
  15. 15.191 + 68 =
  16. 16.294 + 78 =
  17. 17.291 + 37 =
  18. 18.289 + 69 =
  19. 19.209 + 47 =
  20. 20.135 + 57 =
  21. 21.217 + 47 =
  22. 22.322 + 47 =
  23. 23.461 + 39 =
  24. 24.276 + 59 =
  25. 25.122 + 37 =
  26. 26.482 + 79 =
  27. 27.237 + 29 =
  28. 28.199 + 17 =
  29. 29.94 + 48 =
  30. 30.392 + 48 =
  31. 31.405 + 77 =
  32. 32.219 + 58 =
  33. 33.147 + 17 =
  34. 34.232 + 98 =
  35. 35.482 + 48 =
  36. 36.32 + 48 =
  37. 37.58 + 97 =
  38. 38.42 + 59 =
  39. 39.470 + 88 =
  40. 40.382 + 88 =

Answer key

  1. 384
  2. 146
  3. 345
  4. 112
  5. 475
  6. 447
  7. 274
  8. 476
  9. 108
  10. 528
  11. 450
  12. 127
  13. 140
  14. 454
  15. 259
  16. 372
  17. 328
  18. 358
  19. 256
  20. 192
  21. 264
  22. 369
  23. 500
  24. 335
  25. 159
  26. 561
  27. 266
  28. 216
  29. 142
  30. 440
  31. 482
  32. 277
  33. 164
  34. 330
  35. 530
  36. 80
  37. 155
  38. 101
  39. 558
  40. 470

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