← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 197 · 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. 1.48 + 18 =
  2. 2.233 + 77 =
  3. 3.378 + 68 =
  4. 4.378 + 37 =
  5. 5.317 + 98 =
  6. 6.91 + 57 =
  7. 7.473 + 78 =
  8. 8.194 + 18 =
  9. 9.219 + 38 =
  10. 10.403 + 59 =
  11. 11.154 + 49 =
  12. 12.426 + 28 =
  13. 13.345 + 69 =
  14. 14.163 + 89 =
  15. 15.61 + 89 =
  16. 16.84 + 17 =
  17. 17.395 + 68 =
  18. 18.461 + 19 =
  19. 19.396 + 79 =
  20. 20.232 + 49 =
  21. 21.57 + 99 =
  22. 22.201 + 18 =
  23. 23.283 + 18 =
  24. 24.440 + 37 =
  25. 25.32 + 79 =
  26. 26.483 + 38 =
  27. 27.243 + 87 =
  28. 28.239 + 27 =
  29. 29.89 + 67 =
  30. 30.249 + 49 =
  31. 31.250 + 48 =
  32. 32.85 + 79 =
  33. 33.38 + 47 =
  34. 34.389 + 87 =
  35. 35.38 + 47 =
  36. 36.138 + 49 =
  37. 37.401 + 77 =
  38. 38.226 + 19 =
  39. 39.152 + 57 =
  40. 40.466 + 87 =

Answer key

  1. 66
  2. 310
  3. 446
  4. 415
  5. 415
  6. 148
  7. 551
  8. 212
  9. 257
  10. 462
  11. 203
  12. 454
  13. 414
  14. 252
  15. 150
  16. 101
  17. 463
  18. 480
  19. 475
  20. 281
  21. 156
  22. 219
  23. 301
  24. 477
  25. 111
  26. 521
  27. 330
  28. 266
  29. 156
  30. 298
  31. 298
  32. 164
  33. 85
  34. 476
  35. 85
  36. 187
  37. 478
  38. 245
  39. 209
  40. 553

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