If you mean to make 1.7847 to something more like 1.8 or 2 then you'd round the number.
It depends on what your rounding to ex: nearest tenth, hundredth
1.7847 - round to nearest hundredth: If a number is higher than 5, it creates the number before it to be higher.
1.7847 → 1.785 → 1.79 this is the nearest hundredth
Hope this helped