Fractions are expressed as one number over another number, like this:
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. For example:
Unit 1 show you how to do this multiplication.
Dividing fractions means determining how many smaller pieces there are in a larger piece. For example:
This means there are 2 one-fourth pieces of pizza in a half pizza.
Unit 4 shows you how to do this division.
Unit 12 will introduce you to decimals.
Here's another way to look at fractions. Imagine that each of these lines is a board and you want to cut it into halves, thirds, fourths, sixths, and fifths. Here is what those board fractions look like:
|1/2 board||1/2 board|
|1/4 board||1/4 board||1/4 board||1/4 board|
|1/3 board||1/3 board||1/3 board|
|1/6 board||1/6 board||1/6 board||1/6 board||1/6 board||1/6 board|
|1/5 board||1/5 board||1/5 board||1/5 board||1/5 board|