What 7.3087 rounded to the nearest thouaanth

7.309

The thousandth is third number to the right of the decimal. We round 5 + up and 4 - we round down.

So we round the decimal into third place, the fourth place is the 7 so we round that up, and we get 7.309

If you round 7.3087 to the nearest thousandth it would be 7.3090.