Percent is many times used to show change. It can be used to show percentage of increase or percentage of decrease. This is a concept that GED math students need to be able to demonstrate.

If you remember some simple key ideas, and practice a variety of problems, it will be easier to solve quickly on the GED math test.

- Determine the amount of change. The amount of change is the difference between the new number and the original number.
- Divide the amount of change by the original number. This will result in a decimal number.
- Change the decimal number to a percent.
- Remember that percent of increase CAN be greater than 100%.

New number – original number/ original number = decimal number = percentage of increase or decrease.