With rounding:

is less than

so we round it down to whole number:


is more than

so we round it up to whole number:

Now we have to add rounded numbers

Without rounding:

to make it more visible I will write it differently:

is equal to

we can see that

is equal to

so:

<span>As you see in this example those equations are equal so it doesn't matter if you take rounded numbers or not, it may be different in case like

(

is just an example it could be any other number between

) because in this case it will be equal

and another example

(in this case

is just an example, it can be any other number between

:) ) and here, answer for this equation is

.</span>