← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 939 · 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. 1.252 + 67 =
  2. 2.221 + 18 =
  3. 3.443 + 17 =
  4. 4.30 + 59 =
  5. 5.446 + 48 =
  6. 6.28 + 28 =
  7. 7.213 + 49 =
  8. 8.66 + 18 =
  9. 9.52 + 39 =
  10. 10.497 + 17 =
  11. 11.112 + 57 =
  12. 12.400 + 87 =
  13. 13.51 + 59 =
  14. 14.101 + 67 =
  15. 15.306 + 69 =
  16. 16.173 + 99 =
  17. 17.85 + 27 =
  18. 18.193 + 27 =
  19. 19.468 + 68 =
  20. 20.138 + 27 =
  21. 21.369 + 77 =
  22. 22.452 + 49 =
  23. 23.125 + 49 =
  24. 24.390 + 97 =
  25. 25.497 + 18 =
  26. 26.374 + 58 =
  27. 27.395 + 47 =
  28. 28.328 + 97 =
  29. 29.55 + 27 =
  30. 30.359 + 38 =
  31. 31.319 + 48 =
  32. 32.31 + 28 =
  33. 33.54 + 68 =
  34. 34.72 + 88 =
  35. 35.142 + 38 =
  36. 36.490 + 37 =
  37. 37.344 + 89 =
  38. 38.464 + 39 =
  39. 39.93 + 18 =
  40. 40.347 + 59 =

Answer key

  1. 319
  2. 239
  3. 460
  4. 89
  5. 494
  6. 56
  7. 262
  8. 84
  9. 91
  10. 514
  11. 169
  12. 487
  13. 110
  14. 168
  15. 375
  16. 272
  17. 112
  18. 220
  19. 536
  20. 165
  21. 446
  22. 501
  23. 174
  24. 487
  25. 515
  26. 432
  27. 442
  28. 425
  29. 82
  30. 397
  31. 367
  32. 59
  33. 122
  34. 160
  35. 180
  36. 527
  37. 433
  38. 503
  39. 111
  40. 406

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