Introduction to Fractions

1. What is a fraction?


A fraction is a part of a whole.

2. What are numerator and denominator?

A fraction has got two numbers.
The top number is called the numerator.
The bottom number is called the denominator.

3. Annie, Betty and Charlie shared a pizza that was cut into 4 slices.
     Annie got 1 slice, Betty got 2 slices and Charlie got 1 slice.
     What fraction of the pizza did each of them receive?

1
4
is read as
"1 upon 4" or
"1 over 4" or
"1 out of 4".
Annie:
Annie received 1 slice.
So, her share of the pizza was
1
4
.
The numerator, which is 1, tells us how many slices Annie got.
The denominator, which is 4, tells us how many equal slices the pizza was cut into.
Betty:
Betty received 2 slices of the pizza.
Betty's share of the pizza was
2
4
.
2
4
can be simplified to
1
2
.
So, Betty's share of the pizza was
2
4
or
1
2
.
Charlie:
Charlie received 1 out of the 4 slices that the pizza was cut into.
Charlie's share of the pizza was
1
4
.