Ratios and Rates (Jump to: Lecture | Video )


A ratio is a direct comparison of two numbers through division.

For example, imagine a bag has 10 marbles inside of it. 7 of the marbles are red, while the other 3 marbles are blue. The ratio of red to blue can be displayed in several ways:


7 to 3



A rate is a ratio where the two numbers being compared have different units.

Miles per hour(mph) is a rate. An example using this rate would be “150 miles in 4 hours”.

This is a rate because two numbers with different units are being compared. 150 is measured using the unit of “miles”, while 4 is measured using the unit of “hours”.

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