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In order to understand the information on this page, it can be helpful to already know:

Outline
Evaluation by substitution is to take an algebraic expression and substitute (replace) each variable with its value.
For example, if x=3 and y=5 then the following expression can be evaluated by replacing the variable names with the corresponding number each time they occur:
Worked Examples
{coming soon}
Practice
You can practice skills in percent using the following references:
Khan Academy
Make sure you are logged in to Khan Academy when doing these exercises so your practice is recorded.
Application
Percentages are often used in financial applications where a proportion calculation is required. These include:
 Discounts (percentage of original price)
 Profit margin (percentage of sale price)
 Tips (percentage of total bill)
 Loan or Deposit interest (percentage of balance)
Next Steps
Comfortable with percents? Check out the followon mathematics you can now do:
 Simple interest
 Compound interest
 Probability