Both parts of a fraction tell us something important. The bottom number (denominator) tells how many equal parts are in each whole or group. The top number (numerator) tells how many of those parts we use. In the fraction 
, the 4 tells that there are 4 parts in each whole. The 3 tells that we are going to use 3 of those parts. So 
tells us that 3 out of 4 parts are being used.
What about fractions that equal one? If a fraction equals one, all of the parts are being used. If a group has 4 parts, and you use all 4 parts, then the fraction would be 
. If a group has 10 parts, and you use all 10 parts, then the fraction is 
. If the bottom number of a fraction is 8, and the fraction equals one whole, what is the top number? The top number would have to be 8, since 
equals one whole. Remember, if the bottom number and the top number are equal, then the fraction equals one.
