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This works a lot like addition...
Let's try
Look at a pizza cut into 8
pieces. Each piece 
is 
of the pizza.
 
Take 
away (that's 3 pieces):
We're left with 4 pieces -
that's .
So
But, look what we really
did!
We just subtracted the numerators!
which is 
Continued on the
next page
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