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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 187 · 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. 1.476 + 39 =
  2. 2.170 + 48 =
  3. 3.75 + 17 =
  4. 4.444 + 69 =
  5. 5.38 + 17 =
  6. 6.98 + 77 =
  7. 7.240 + 38 =
  8. 8.277 + 38 =
  9. 9.119 + 18 =
  10. 10.281 + 99 =
  11. 11.321 + 87 =
  12. 12.294 + 19 =
  13. 13.403 + 28 =
  14. 14.411 + 59 =
  15. 15.215 + 27 =
  16. 16.182 + 89 =
  17. 17.398 + 27 =
  18. 18.499 + 27 =
  19. 19.81 + 78 =
  20. 20.251 + 77 =
  21. 21.127 + 38 =
  22. 22.192 + 69 =
  23. 23.36 + 78 =
  24. 24.179 + 29 =
  25. 25.109 + 27 =
  26. 26.325 + 57 =
  27. 27.98 + 88 =
  28. 28.83 + 27 =
  29. 29.433 + 97 =
  30. 30.461 + 77 =
  31. 31.478 + 77 =
  32. 32.124 + 28 =
  33. 33.485 + 49 =
  34. 34.147 + 17 =
  35. 35.331 + 98 =
  36. 36.238 + 37 =
  37. 37.255 + 58 =
  38. 38.377 + 37 =
  39. 39.455 + 17 =
  40. 40.91 + 48 =

Answer key

  1. 515
  2. 218
  3. 92
  4. 513
  5. 55
  6. 175
  7. 278
  8. 315
  9. 137
  10. 380
  11. 408
  12. 313
  13. 431
  14. 470
  15. 242
  16. 271
  17. 425
  18. 526
  19. 159
  20. 328
  21. 165
  22. 261
  23. 114
  24. 208
  25. 136
  26. 382
  27. 186
  28. 110
  29. 530
  30. 538
  31. 555
  32. 152
  33. 534
  34. 164
  35. 429
  36. 275
  37. 313
  38. 414
  39. 472
  40. 139

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