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:
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 follow-on mathematics you can now do:
- Simple interest
- Compound interest
- Probability