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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 766 · 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. 1.273 + 79 =
  2. 2.142 + 77 =
  3. 3.29 + 77 =
  4. 4.194 + 77 =
  5. 5.188 + 17 =
  6. 6.464 + 88 =
  7. 7.46 + 59 =
  8. 8.143 + 28 =
  9. 9.47 + 57 =
  10. 10.474 + 77 =
  11. 11.447 + 87 =
  12. 12.309 + 29 =
  13. 13.396 + 57 =
  14. 14.433 + 27 =
  15. 15.121 + 27 =
  16. 16.448 + 17 =
  17. 17.234 + 78 =
  18. 18.284 + 89 =
  19. 19.289 + 19 =
  20. 20.433 + 49 =
  21. 21.126 + 98 =
  22. 22.474 + 39 =
  23. 23.283 + 67 =
  24. 24.136 + 78 =
  25. 25.64 + 19 =
  26. 26.464 + 77 =
  27. 27.79 + 37 =
  28. 28.281 + 47 =
  29. 29.93 + 87 =
  30. 30.66 + 57 =
  31. 31.441 + 99 =
  32. 32.314 + 37 =
  33. 33.419 + 18 =
  34. 34.297 + 69 =
  35. 35.403 + 77 =
  36. 36.138 + 87 =
  37. 37.462 + 38 =
  38. 38.463 + 59 =
  39. 39.127 + 27 =
  40. 40.375 + 67 =

Answer key

  1. 352
  2. 219
  3. 106
  4. 271
  5. 205
  6. 552
  7. 105
  8. 171
  9. 104
  10. 551
  11. 534
  12. 338
  13. 453
  14. 460
  15. 148
  16. 465
  17. 312
  18. 373
  19. 308
  20. 482
  21. 224
  22. 513
  23. 350
  24. 214
  25. 83
  26. 541
  27. 116
  28. 328
  29. 180
  30. 123
  31. 540
  32. 351
  33. 437
  34. 366
  35. 480
  36. 225
  37. 500
  38. 522
  39. 154
  40. 442

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