← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 979 · 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. 1.45 + 39 =
  2. 2.138 + 49 =
  3. 3.482 + 39 =
  4. 4.470 + 89 =
  5. 5.162 + 99 =
  6. 6.256 + 48 =
  7. 7.174 + 27 =
  8. 8.82 + 69 =
  9. 9.291 + 87 =
  10. 10.66 + 79 =
  11. 11.180 + 79 =
  12. 12.344 + 29 =
  13. 13.88 + 68 =
  14. 14.119 + 99 =
  15. 15.53 + 97 =
  16. 16.268 + 88 =
  17. 17.273 + 38 =
  18. 18.59 + 37 =
  19. 19.281 + 48 =
  20. 20.264 + 77 =
  21. 21.227 + 39 =
  22. 22.97 + 28 =
  23. 23.155 + 19 =
  24. 24.147 + 47 =
  25. 25.494 + 68 =
  26. 26.34 + 88 =
  27. 27.143 + 98 =
  28. 28.216 + 87 =
  29. 29.174 + 37 =
  30. 30.495 + 87 =
  31. 31.55 + 87 =
  32. 32.356 + 28 =
  33. 33.414 + 59 =
  34. 34.203 + 77 =
  35. 35.336 + 99 =
  36. 36.446 + 29 =
  37. 37.35 + 17 =
  38. 38.201 + 67 =
  39. 39.462 + 47 =
  40. 40.195 + 88 =

Answer key

  1. 84
  2. 187
  3. 521
  4. 559
  5. 261
  6. 304
  7. 201
  8. 151
  9. 378
  10. 145
  11. 259
  12. 373
  13. 156
  14. 218
  15. 150
  16. 356
  17. 311
  18. 96
  19. 329
  20. 341
  21. 266
  22. 125
  23. 174
  24. 194
  25. 562
  26. 122
  27. 241
  28. 303
  29. 211
  30. 582
  31. 142
  32. 384
  33. 473
  34. 280
  35. 435
  36. 475
  37. 52
  38. 268
  39. 509
  40. 283

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