← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 832 · 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. 1.440 + 68 =
  2. 2.33 + 79 =
  3. 3.187 + 29 =
  4. 4.332 + 37 =
  5. 5.332 + 59 =
  6. 6.389 + 17 =
  7. 7.345 + 87 =
  8. 8.480 + 39 =
  9. 9.92 + 27 =
  10. 10.100 + 58 =
  11. 11.109 + 58 =
  12. 12.475 + 88 =
  13. 13.43 + 57 =
  14. 14.462 + 47 =
  15. 15.104 + 88 =
  16. 16.197 + 98 =
  17. 17.449 + 17 =
  18. 18.459 + 27 =
  19. 19.326 + 29 =
  20. 20.207 + 19 =
  21. 21.177 + 18 =
  22. 22.297 + 59 =
  23. 23.133 + 99 =
  24. 24.174 + 89 =
  25. 25.167 + 97 =
  26. 26.132 + 58 =
  27. 27.150 + 49 =
  28. 28.488 + 47 =
  29. 29.48 + 57 =
  30. 30.286 + 27 =
  31. 31.36 + 68 =
  32. 32.252 + 38 =
  33. 33.134 + 17 =
  34. 34.326 + 29 =
  35. 35.235 + 89 =
  36. 36.214 + 67 =
  37. 37.377 + 27 =
  38. 38.50 + 67 =
  39. 39.472 + 48 =
  40. 40.251 + 87 =

Answer key

  1. 508
  2. 112
  3. 216
  4. 369
  5. 391
  6. 406
  7. 432
  8. 519
  9. 119
  10. 158
  11. 167
  12. 563
  13. 100
  14. 509
  15. 192
  16. 295
  17. 466
  18. 486
  19. 355
  20. 226
  21. 195
  22. 356
  23. 232
  24. 263
  25. 264
  26. 190
  27. 199
  28. 535
  29. 105
  30. 313
  31. 104
  32. 290
  33. 151
  34. 355
  35. 324
  36. 281
  37. 404
  38. 117
  39. 520
  40. 338

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