Fractions are expressed as one number over another number, like this:
<== This mean a half of something!
The number on the top is called the numerator and the number on the bottom is called the denominator.

When you think of a fraction, think of a PIZZA!!

Suppose a pizza is cut evenly into the number of pieces in the DENOMINATOR.
If the number of pieces YOU get is the NUMERATOR, the fraction of the pizza you get is:

Adding and taking away (subtracting) fractions can be pictured using slices of pizza. For example:

Multiplying fractions means cutting a portion into smaller portions.
Example 1:
        1     1     1
       --- X --- = ---
        2     2     4
Means: half of a half = a fourth!
Example 2:
        1     1     1
       --- X --- = ---
        2     3     6
Means: half of a third = a sixth!

Unit 1 show you how to do this multiplication.