- Know your formulas: Simple interest, commission, sales tax, percent equation, percent increase/decrease, degrees, perimiter and area.
- Do not confuse cross product with cross reducing. You cannot reduce the numerator on one side of the equation with the denominator on the other side of the equation. You can only cross multiply!
- When converting repeating decimals to percent make sure you take your repeat out far enough to move the decimal point two places to the right.
- Note that the percent is always followed by the of in percent equations and proportions. Of after percents and fractions means to multiply.
- Note that for percent increase or decrease the number in the denominator is ALWAYS the original amount.