← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 162 · 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. 1.377 + 48 =
  2. 2.458 + 17 =
  3. 3.207 + 68 =
  4. 4.194 + 58 =
  5. 5.92 + 88 =
  6. 6.424 + 99 =
  7. 7.397 + 98 =
  8. 8.30 + 67 =
  9. 9.479 + 68 =
  10. 10.211 + 97 =
  11. 11.142 + 69 =
  12. 12.222 + 99 =
  13. 13.60 + 49 =
  14. 14.160 + 78 =
  15. 15.232 + 28 =
  16. 16.163 + 37 =
  17. 17.433 + 38 =
  18. 18.442 + 67 =
  19. 19.31 + 67 =
  20. 20.455 + 39 =
  21. 21.323 + 38 =
  22. 22.463 + 88 =
  23. 23.48 + 18 =
  24. 24.317 + 77 =
  25. 25.77 + 58 =
  26. 26.159 + 69 =
  27. 27.162 + 38 =
  28. 28.137 + 88 =
  29. 29.420 + 99 =
  30. 30.297 + 47 =
  31. 31.302 + 78 =
  32. 32.127 + 47 =
  33. 33.128 + 18 =
  34. 34.41 + 87 =
  35. 35.109 + 78 =
  36. 36.216 + 89 =
  37. 37.192 + 57 =
  38. 38.80 + 17 =
  39. 39.317 + 38 =
  40. 40.351 + 68 =

Answer key

  1. 425
  2. 475
  3. 275
  4. 252
  5. 180
  6. 523
  7. 495
  8. 97
  9. 547
  10. 308
  11. 211
  12. 321
  13. 109
  14. 238
  15. 260
  16. 200
  17. 471
  18. 509
  19. 98
  20. 494
  21. 361
  22. 551
  23. 66
  24. 394
  25. 135
  26. 228
  27. 200
  28. 225
  29. 519
  30. 344
  31. 380
  32. 174
  33. 146
  34. 128
  35. 187
  36. 305
  37. 249
  38. 97
  39. 355
  40. 419

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