Step 1: Rational Decimals?
Irrational numbers cannot.
Irrational numbers include:
e (don't worry about this kids, but yes, e is the number 2.71828182845904523536028747135266... approximately)
the square root of 2 (sounds harmless enough)
numbers with increasing patterns ie 0.1212212221222212222212222221222222212222222212.....
Irrational numbers cannot be made into fractions because they are non-repeating and continue infinitely. Make sense?
Step 2: Basic Decimals
If there is a number in the place of the zero before the decimal, you multiply it by the denominator. This number is then added to the numerator.
Or in other words, you move the decimal two places to the right, literally. (see the second picture)
Step 3: Repeating Decimals
this can be shown algebraically: