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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 347 · 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. 1.72 + 98 =
  2. 2.135 + 17 =
  3. 3.307 + 68 =
  4. 4.481 + 48 =
  5. 5.136 + 47 =
  6. 6.206 + 27 =
  7. 7.257 + 87 =
  8. 8.276 + 89 =
  9. 9.47 + 49 =
  10. 10.154 + 88 =
  11. 11.127 + 88 =
  12. 12.453 + 58 =
  13. 13.478 + 39 =
  14. 14.69 + 77 =
  15. 15.288 + 19 =
  16. 16.448 + 67 =
  17. 17.409 + 29 =
  18. 18.147 + 59 =
  19. 19.483 + 79 =
  20. 20.138 + 68 =
  21. 21.201 + 38 =
  22. 22.96 + 38 =
  23. 23.168 + 17 =
  24. 24.279 + 67 =
  25. 25.46 + 17 =
  26. 26.107 + 59 =
  27. 27.256 + 37 =
  28. 28.59 + 67 =
  29. 29.76 + 17 =
  30. 30.37 + 79 =
  31. 31.281 + 38 =
  32. 32.111 + 58 =
  33. 33.283 + 19 =
  34. 34.375 + 27 =
  35. 35.29 + 89 =
  36. 36.393 + 28 =
  37. 37.182 + 58 =
  38. 38.493 + 67 =
  39. 39.373 + 68 =
  40. 40.325 + 28 =

Answer key

  1. 170
  2. 152
  3. 375
  4. 529
  5. 183
  6. 233
  7. 344
  8. 365
  9. 96
  10. 242
  11. 215
  12. 511
  13. 517
  14. 146
  15. 307
  16. 515
  17. 438
  18. 206
  19. 562
  20. 206
  21. 239
  22. 134
  23. 185
  24. 346
  25. 63
  26. 166
  27. 293
  28. 126
  29. 93
  30. 116
  31. 319
  32. 169
  33. 302
  34. 402
  35. 118
  36. 421
  37. 240
  38. 560
  39. 441
  40. 353

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