← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 530 · 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. 1.67 + 47 =
  2. 2.458 + 17 =
  3. 3.495 + 27 =
  4. 4.415 + 17 =
  5. 5.195 + 17 =
  6. 6.428 + 88 =
  7. 7.448 + 98 =
  8. 8.496 + 78 =
  9. 9.395 + 37 =
  10. 10.320 + 37 =
  11. 11.487 + 97 =
  12. 12.62 + 69 =
  13. 13.381 + 39 =
  14. 14.443 + 18 =
  15. 15.318 + 27 =
  16. 16.476 + 18 =
  17. 17.108 + 58 =
  18. 18.89 + 99 =
  19. 19.145 + 87 =
  20. 20.178 + 39 =
  21. 21.447 + 47 =
  22. 22.482 + 58 =
  23. 23.123 + 37 =
  24. 24.73 + 98 =
  25. 25.45 + 57 =
  26. 26.146 + 99 =
  27. 27.90 + 98 =
  28. 28.124 + 88 =
  29. 29.201 + 69 =
  30. 30.170 + 68 =
  31. 31.111 + 18 =
  32. 32.205 + 18 =
  33. 33.113 + 38 =
  34. 34.318 + 99 =
  35. 35.249 + 19 =
  36. 36.486 + 27 =
  37. 37.35 + 19 =
  38. 38.166 + 97 =
  39. 39.86 + 87 =
  40. 40.365 + 28 =

Answer key

  1. 114
  2. 475
  3. 522
  4. 432
  5. 212
  6. 516
  7. 546
  8. 574
  9. 432
  10. 357
  11. 584
  12. 131
  13. 420
  14. 461
  15. 345
  16. 494
  17. 166
  18. 188
  19. 232
  20. 217
  21. 494
  22. 540
  23. 160
  24. 171
  25. 102
  26. 245
  27. 188
  28. 212
  29. 270
  30. 238
  31. 129
  32. 223
  33. 151
  34. 417
  35. 268
  36. 513
  37. 54
  38. 263
  39. 173
  40. 393

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