Hi,
The MOD(Number,Divisor) function returns the remainder after division, so if
you divide by 1 you are taking the remainder after division by 1 which is the
decimal portion of the number.
It is better Excel practice to reference cells than to hard code numbers
into formulas - so in the original example, sum(48*2.128%), it would have
been better to enter 48 into cell A1 and 2.128% into A2 and then calculate
the results in A3.
As already pointed out SUM is not necessary regardless of how you choose to
solve the problem. This is bad formula design to use things such as
=SUM(A1*B1)
=SUM(A1/B1)
=SUM(A1-B1)
=SUM(A1+B1)
These should be written:
=A1*B1
=A1/B1
=A1-B1
=A1+B1
respectively. Once the internal calculation has been made, for example
A1*B1 Excel has a single number, the result of that calculation. So what is
the sum of a single number? The number itself.
Do these longer versions return the correct results? Yes! But they require
more typing, they occupy more memory, and slow down calculations.