← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 753 · 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. 1.204 + 98 =
  2. 2.198 + 78 =
  3. 3.331 + 27 =
  4. 4.366 + 79 =
  5. 5.416 + 78 =
  6. 6.375 + 37 =
  7. 7.212 + 19 =
  8. 8.258 + 57 =
  9. 9.434 + 79 =
  10. 10.437 + 29 =
  11. 11.137 + 27 =
  12. 12.70 + 99 =
  13. 13.80 + 57 =
  14. 14.248 + 67 =
  15. 15.157 + 68 =
  16. 16.376 + 69 =
  17. 17.251 + 37 =
  18. 18.204 + 98 =
  19. 19.96 + 78 =
  20. 20.375 + 88 =
  21. 21.179 + 38 =
  22. 22.137 + 68 =
  23. 23.272 + 89 =
  24. 24.309 + 58 =
  25. 25.493 + 69 =
  26. 26.165 + 19 =
  27. 27.348 + 98 =
  28. 28.101 + 67 =
  29. 29.51 + 48 =
  30. 30.483 + 89 =
  31. 31.383 + 29 =
  32. 32.175 + 88 =
  33. 33.277 + 79 =
  34. 34.269 + 48 =
  35. 35.194 + 98 =
  36. 36.106 + 27 =
  37. 37.51 + 99 =
  38. 38.25 + 38 =
  39. 39.306 + 88 =
  40. 40.122 + 27 =

Answer key

  1. 302
  2. 276
  3. 358
  4. 445
  5. 494
  6. 412
  7. 231
  8. 315
  9. 513
  10. 466
  11. 164
  12. 169
  13. 137
  14. 315
  15. 225
  16. 445
  17. 288
  18. 302
  19. 174
  20. 463
  21. 217
  22. 205
  23. 361
  24. 367
  25. 562
  26. 184
  27. 446
  28. 168
  29. 99
  30. 572
  31. 412
  32. 263
  33. 356
  34. 317
  35. 292
  36. 133
  37. 150
  38. 63
  39. 394
  40. 149

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