Shapes

Categories

Ratios

Rates

Speed

What shape

is this?

What shape

is this?

All rectangles

All

squares are rectangles.

A square is a special

kind of rectangle.

All ratios

All

rates are ratios.

A rate is a special

kind of ratio.

A ratio is just a comparison of amounts.

For example: In Ms. Litton’s class, there are 15 girls to 16 boys. You can also write this in other ways:

>> What is the gender ratio in your class?

By the way, it is also correct to use a total in the comparison. For example: In Ms. Litton’s class there are 15 girls to 31 total students. It’s more like a simple fraction this way, but it’s still correct.

A rate is a special type of ratio that uses two different kinds of units together to give information.

When you use two totally different units. This is a rate.

You also use rates when you talk about speed.

Speed is always a rate: