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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 76 · 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. 1.423 + 58 =
  2. 2.457 + 49 =
  3. 3.230 + 28 =
  4. 4.258 + 39 =
  5. 5.390 + 37 =
  6. 6.210 + 39 =
  7. 7.162 + 49 =
  8. 8.468 + 88 =
  9. 9.324 + 18 =
  10. 10.73 + 37 =
  11. 11.55 + 59 =
  12. 12.105 + 29 =
  13. 13.339 + 38 =
  14. 14.338 + 28 =
  15. 15.125 + 88 =
  16. 16.227 + 77 =
  17. 17.376 + 99 =
  18. 18.203 + 87 =
  19. 19.477 + 17 =
  20. 20.473 + 38 =
  21. 21.330 + 79 =
  22. 22.290 + 38 =
  23. 23.267 + 59 =
  24. 24.308 + 48 =
  25. 25.414 + 88 =
  26. 26.265 + 58 =
  27. 27.105 + 37 =
  28. 28.83 + 59 =
  29. 29.349 + 68 =
  30. 30.86 + 89 =
  31. 31.334 + 47 =
  32. 32.123 + 28 =
  33. 33.149 + 17 =
  34. 34.453 + 99 =
  35. 35.355 + 77 =
  36. 36.152 + 58 =
  37. 37.442 + 77 =
  38. 38.388 + 59 =
  39. 39.96 + 98 =
  40. 40.142 + 88 =

Answer key

  1. 481
  2. 506
  3. 258
  4. 297
  5. 427
  6. 249
  7. 211
  8. 556
  9. 342
  10. 110
  11. 114
  12. 134
  13. 377
  14. 366
  15. 213
  16. 304
  17. 475
  18. 290
  19. 494
  20. 511
  21. 409
  22. 328
  23. 326
  24. 356
  25. 502
  26. 323
  27. 142
  28. 142
  29. 417
  30. 175
  31. 381
  32. 151
  33. 166
  34. 552
  35. 432
  36. 210
  37. 519
  38. 447
  39. 194
  40. 230

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