What is a fraction?
A fraction is a part of a whole.
A fraction is a part of a whole.
Numerator and denominator
A fraction has got two numbers. The top number is called the numerator and the bottom number is called the denominator.
Problem
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?
Annie received 1 slice. So her
share of the pizza was1
4
The numerator, which is 1, tells us how many slices Annie got and the denominator, which is 4,
tells us how many equal slices the pizza was cut into.
Similarly, since Betty received 2 slices of the pizza, we say, "Betty's share was2
4
of the whole pizza". Also, since Charlie got 1 out of the 4 slices that the pizza was cut into, we say,
"the fraction of the whole pizza that Charlie received was1" or "Charlie got1 of the pizza."
4 4
share of the pizza was1
4
The numerator, which is 1, tells us how many slices Annie got and the denominator, which is 4,
tells us how many equal slices the pizza was cut into.
Similarly, since Betty received 2 slices of the pizza, we say, "Betty's share was2
4
of the whole pizza". Also, since Charlie got 1 out of the 4 slices that the pizza was cut into, we say,
"the fraction of the whole pizza that Charlie received was1" or "Charlie got1 of the pizza."
4 4
http://www.youtube.com/watch?v=jPpZnWyvyMk