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4.2 Unit Rates and Proportional ReasoningPowerPoint Presentation

4.2 Unit Rates and Proportional Reasoning

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4.2 Unit Rates and Proportional Reasoning

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4.2 Unit Rates and Proportional Reasoning

I can find unit rates and unit costs using proportional Reasoning

Ratios comparing two quantities measured in different units.

Ex: Miles per hour (distance and time)

- Rate for one unit of a given quantity
- To find a unit rate, divide the first quantity by the second.
- Ex: there are 15 grams of fat in 5 servings of canned soup.
- What is this expressed as a rate?
- What is the unit rate? That is, how much per 1 serving?
- 3 grams per serving

Find the unit rate for 210 heartbeats in 3 minutes.

70 beats per minute

Units need to be included

- Cindy walks of a mile in of an hour. What is her speed?
- Hint (Miles per hour)
- Number of miles divided by number of hours
- miles per hour

A unit rate that gives cost per unit

Divide total cost by number of items or units in the item.

You can compare prices using unit costs.

Ex: Which size of shampoo is the better

buy?

The smaller bottle

ODDS Only

P.134 #7-23