← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 554 · 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. 1.326 + 47 =
  2. 2.193 + 99 =
  3. 3.182 + 37 =
  4. 4.245 + 37 =
  5. 5.54 + 97 =
  6. 6.258 + 47 =
  7. 7.225 + 97 =
  8. 8.387 + 99 =
  9. 9.290 + 99 =
  10. 10.482 + 79 =
  11. 11.151 + 67 =
  12. 12.497 + 27 =
  13. 13.61 + 59 =
  14. 14.115 + 39 =
  15. 15.286 + 78 =
  16. 16.33 + 37 =
  17. 17.63 + 97 =
  18. 18.347 + 97 =
  19. 19.267 + 78 =
  20. 20.201 + 39 =
  21. 21.218 + 88 =
  22. 22.179 + 88 =
  23. 23.453 + 27 =
  24. 24.391 + 39 =
  25. 25.99 + 69 =
  26. 26.119 + 57 =
  27. 27.404 + 87 =
  28. 28.449 + 89 =
  29. 29.490 + 39 =
  30. 30.202 + 49 =
  31. 31.449 + 27 =
  32. 32.396 + 99 =
  33. 33.25 + 39 =
  34. 34.352 + 77 =
  35. 35.266 + 67 =
  36. 36.312 + 88 =
  37. 37.485 + 49 =
  38. 38.208 + 87 =
  39. 39.164 + 97 =
  40. 40.53 + 29 =

Answer key

  1. 373
  2. 292
  3. 219
  4. 282
  5. 151
  6. 305
  7. 322
  8. 486
  9. 389
  10. 561
  11. 218
  12. 524
  13. 120
  14. 154
  15. 364
  16. 70
  17. 160
  18. 444
  19. 345
  20. 240
  21. 306
  22. 267
  23. 480
  24. 430
  25. 168
  26. 176
  27. 491
  28. 538
  29. 529
  30. 251
  31. 476
  32. 495
  33. 64
  34. 429
  35. 333
  36. 400
  37. 534
  38. 295
  39. 261
  40. 82

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