← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 404 · 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. 1.315 + 97 =
  2. 2.78 + 98 =
  3. 3.110 + 89 =
  4. 4.309 + 19 =
  5. 5.416 + 18 =
  6. 6.452 + 39 =
  7. 7.28 + 97 =
  8. 8.365 + 38 =
  9. 9.388 + 97 =
  10. 10.227 + 88 =
  11. 11.352 + 68 =
  12. 12.74 + 59 =
  13. 13.72 + 69 =
  14. 14.59 + 87 =
  15. 15.84 + 28 =
  16. 16.188 + 99 =
  17. 17.210 + 68 =
  18. 18.262 + 38 =
  19. 19.289 + 37 =
  20. 20.27 + 29 =
  21. 21.110 + 28 =
  22. 22.495 + 98 =
  23. 23.105 + 47 =
  24. 24.407 + 89 =
  25. 25.107 + 37 =
  26. 26.77 + 39 =
  27. 27.357 + 29 =
  28. 28.393 + 59 =
  29. 29.364 + 19 =
  30. 30.446 + 58 =
  31. 31.113 + 69 =
  32. 32.290 + 87 =
  33. 33.194 + 78 =
  34. 34.445 + 99 =
  35. 35.390 + 38 =
  36. 36.103 + 88 =
  37. 37.381 + 38 =
  38. 38.52 + 99 =
  39. 39.316 + 39 =
  40. 40.401 + 88 =

Answer key

  1. 412
  2. 176
  3. 199
  4. 328
  5. 434
  6. 491
  7. 125
  8. 403
  9. 485
  10. 315
  11. 420
  12. 133
  13. 141
  14. 146
  15. 112
  16. 287
  17. 278
  18. 300
  19. 326
  20. 56
  21. 138
  22. 593
  23. 152
  24. 496
  25. 144
  26. 116
  27. 386
  28. 452
  29. 383
  30. 504
  31. 182
  32. 377
  33. 272
  34. 544
  35. 428
  36. 191
  37. 419
  38. 151
  39. 355
  40. 489

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