# Rates

4 videos

2 skills

It can be useful to measure 2 things, but in different units of measurement, and then express that difference as a special ratio. Essentially, this is the definition of rate. We might compare how far a car drives with how long it takes to get to a destination, and then express it as miles per hour. Or perhaps we want to compare the cost of different size bags of jellybeans, which can be expressed as dollars per pound. You get the idea. This tutorial helps you understand these fundamental applications of rate. Common Core Standard: 7.RP.A.1

### Rate problem using fractions

VIDEO
2:56 minutes

One common application of rate is determining speed. Watch as we solve a rate problem finding speed in meters per second using distance (in meters) and time (in seconds).

### Unit cost problem using fractions

VIDEO
3:41 minutes

In this example, we show how unit cost can be determined using an equation with fractions.

### Rate problems 1

PRACTICE PROBLEMS

### Finding average speed or rate

VIDEO
13:15 minutes

Using the formula for finding distance we can determine Usian Bolt's average speed, or rate, when he broke the world record in 2009 in the 100m. Watch.

### Multiple rates word problem

VIDEO
6:28 minutes

Sometimes you'll need to solve for multiple parts of the equation before getting at the answer. Here we solve for average speed, but first we have to determine total distance and total time.

### Rate problems 2

PRACTICE PROBLEMS