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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 574 · 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. 1.294 + 29 =
  2. 2.81 + 88 =
  3. 3.148 + 29 =
  4. 4.421 + 78 =
  5. 5.220 + 77 =
  6. 6.273 + 97 =
  7. 7.221 + 59 =
  8. 8.433 + 19 =
  9. 9.116 + 38 =
  10. 10.309 + 59 =
  11. 11.488 + 37 =
  12. 12.234 + 69 =
  13. 13.45 + 67 =
  14. 14.439 + 77 =
  15. 15.275 + 59 =
  16. 16.259 + 27 =
  17. 17.173 + 67 =
  18. 18.356 + 97 =
  19. 19.326 + 68 =
  20. 20.485 + 79 =
  21. 21.192 + 59 =
  22. 22.356 + 39 =
  23. 23.136 + 38 =
  24. 24.468 + 79 =
  25. 25.181 + 38 =
  26. 26.255 + 67 =
  27. 27.162 + 99 =
  28. 28.130 + 49 =
  29. 29.397 + 69 =
  30. 30.128 + 89 =
  31. 31.439 + 78 =
  32. 32.46 + 18 =
  33. 33.160 + 67 =
  34. 34.177 + 67 =
  35. 35.204 + 38 =
  36. 36.39 + 19 =
  37. 37.277 + 58 =
  38. 38.166 + 37 =
  39. 39.425 + 57 =
  40. 40.251 + 59 =

Answer key

  1. 323
  2. 169
  3. 177
  4. 499
  5. 297
  6. 370
  7. 280
  8. 452
  9. 154
  10. 368
  11. 525
  12. 303
  13. 112
  14. 516
  15. 334
  16. 286
  17. 240
  18. 453
  19. 394
  20. 564
  21. 251
  22. 395
  23. 174
  24. 547
  25. 219
  26. 322
  27. 261
  28. 179
  29. 466
  30. 217
  31. 517
  32. 64
  33. 227
  34. 244
  35. 242
  36. 58
  37. 335
  38. 203
  39. 482
  40. 310

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