Find the GCF of the numerator and denominator and divide them both by it. If the GCF is 1, the fraction is in its simplest form.
You can`t make it in simplest form because you cannot divide it.
You divide 23/100
The decimal 0.125 means 125 parts out of 1000. 125/1000 This is not simplest form yet, divide top and bottom by 5. 25/200 Still not in simplest form yet, divide top and bottom by 5. 5/40 Still not in simplest form, divide top and bottom by 5. 1/8
Divide untitl it is no longer able to divide, that would equal to 40/60 or 40/100