← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 224 · 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. 1.431 + 47 =
  2. 2.49 + 28 =
  3. 3.449 + 18 =
  4. 4.495 + 29 =
  5. 5.36 + 29 =
  6. 6.252 + 17 =
  7. 7.108 + 48 =
  8. 8.175 + 89 =
  9. 9.75 + 69 =
  10. 10.391 + 89 =
  11. 11.377 + 47 =
  12. 12.266 + 37 =
  13. 13.296 + 97 =
  14. 14.42 + 59 =
  15. 15.109 + 28 =
  16. 16.458 + 58 =
  17. 17.156 + 78 =
  18. 18.41 + 89 =
  19. 19.157 + 68 =
  20. 20.250 + 87 =
  21. 21.229 + 58 =
  22. 22.497 + 89 =
  23. 23.368 + 49 =
  24. 24.99 + 88 =
  25. 25.222 + 97 =
  26. 26.225 + 87 =
  27. 27.286 + 49 =
  28. 28.131 + 78 =
  29. 29.42 + 47 =
  30. 30.288 + 37 =
  31. 31.56 + 58 =
  32. 32.471 + 47 =
  33. 33.328 + 69 =
  34. 34.250 + 17 =
  35. 35.94 + 37 =
  36. 36.437 + 18 =
  37. 37.458 + 39 =
  38. 38.37 + 18 =
  39. 39.270 + 68 =
  40. 40.345 + 58 =

Answer key

  1. 478
  2. 77
  3. 467
  4. 524
  5. 65
  6. 269
  7. 156
  8. 264
  9. 144
  10. 480
  11. 424
  12. 303
  13. 393
  14. 101
  15. 137
  16. 516
  17. 234
  18. 130
  19. 225
  20. 337
  21. 287
  22. 586
  23. 417
  24. 187
  25. 319
  26. 312
  27. 335
  28. 209
  29. 89
  30. 325
  31. 114
  32. 518
  33. 397
  34. 267
  35. 131
  36. 455
  37. 497
  38. 55
  39. 338
  40. 403

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