← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 95 · 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. 1.86 + 28 =
  2. 2.223 + 39 =
  3. 3.379 + 39 =
  4. 4.72 + 39 =
  5. 5.494 + 47 =
  6. 6.210 + 89 =
  7. 7.267 + 78 =
  8. 8.410 + 69 =
  9. 9.401 + 17 =
  10. 10.153 + 27 =
  11. 11.279 + 87 =
  12. 12.450 + 48 =
  13. 13.487 + 77 =
  14. 14.326 + 47 =
  15. 15.72 + 47 =
  16. 16.356 + 78 =
  17. 17.243 + 39 =
  18. 18.212 + 28 =
  19. 19.209 + 87 =
  20. 20.138 + 97 =
  21. 21.221 + 59 =
  22. 22.138 + 28 =
  23. 23.93 + 77 =
  24. 24.463 + 59 =
  25. 25.157 + 48 =
  26. 26.234 + 69 =
  27. 27.94 + 79 =
  28. 28.174 + 97 =
  29. 29.41 + 87 =
  30. 30.68 + 49 =
  31. 31.88 + 17 =
  32. 32.158 + 47 =
  33. 33.203 + 58 =
  34. 34.273 + 28 =
  35. 35.434 + 49 =
  36. 36.421 + 68 =
  37. 37.349 + 38 =
  38. 38.307 + 59 =
  39. 39.457 + 19 =
  40. 40.91 + 97 =

Answer key

  1. 114
  2. 262
  3. 418
  4. 111
  5. 541
  6. 299
  7. 345
  8. 479
  9. 418
  10. 180
  11. 366
  12. 498
  13. 564
  14. 373
  15. 119
  16. 434
  17. 282
  18. 240
  19. 296
  20. 235
  21. 280
  22. 166
  23. 170
  24. 522
  25. 205
  26. 303
  27. 173
  28. 271
  29. 128
  30. 117
  31. 105
  32. 205
  33. 261
  34. 301
  35. 483
  36. 489
  37. 387
  38. 366
  39. 476
  40. 188

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths