← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 454 · 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. 1.304 + 38 =
  2. 2.135 + 38 =
  3. 3.292 + 17 =
  4. 4.461 + 77 =
  5. 5.378 + 18 =
  6. 6.25 + 28 =
  7. 7.96 + 89 =
  8. 8.369 + 59 =
  9. 9.31 + 37 =
  10. 10.358 + 58 =
  11. 11.103 + 29 =
  12. 12.211 + 48 =
  13. 13.435 + 37 =
  14. 14.460 + 17 =
  15. 15.262 + 17 =
  16. 16.89 + 57 =
  17. 17.388 + 29 =
  18. 18.372 + 17 =
  19. 19.277 + 97 =
  20. 20.189 + 57 =
  21. 21.440 + 68 =
  22. 22.413 + 39 =
  23. 23.184 + 57 =
  24. 24.232 + 58 =
  25. 25.379 + 48 =
  26. 26.94 + 58 =
  27. 27.397 + 57 =
  28. 28.56 + 48 =
  29. 29.315 + 47 =
  30. 30.236 + 68 =
  31. 31.185 + 48 =
  32. 32.159 + 59 =
  33. 33.186 + 18 =
  34. 34.315 + 49 =
  35. 35.416 + 18 =
  36. 36.494 + 38 =
  37. 37.106 + 78 =
  38. 38.121 + 38 =
  39. 39.130 + 99 =
  40. 40.355 + 98 =

Answer key

  1. 342
  2. 173
  3. 309
  4. 538
  5. 396
  6. 53
  7. 185
  8. 428
  9. 68
  10. 416
  11. 132
  12. 259
  13. 472
  14. 477
  15. 279
  16. 146
  17. 417
  18. 389
  19. 374
  20. 246
  21. 508
  22. 452
  23. 241
  24. 290
  25. 427
  26. 152
  27. 454
  28. 104
  29. 362
  30. 304
  31. 233
  32. 218
  33. 204
  34. 364
  35. 434
  36. 532
  37. 184
  38. 159
  39. 229
  40. 453

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