Introduction to ratios: Your weedeater instructions tell you to put a fuel mixture of gas and oil in the engine, and that ratio is 40:1. What does that mean? Ratios give us the relationship between quantities of two different things.
Watch this video to help you understand how to add on a percentage of an amount. e.g. the price of a pair of jeans was $80 but the price went up by 15%. How much do the jeans cost now?
Growing by a percentage: In this example we grow a whole number by a percentage of itself. Growing by percentage is a common skill often used when figuring how much is owed or earned with interest.