STAAR Review: RATES, RATIOS, AND PERCENTS, DAY 2

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, showing how many times one value contains or is contained within the other.

Front

How do you calculate the percentage decrease in price?

Back

Percentage decrease = ((Old Price - New Price) / Old Price) * 100.

Front

If a recipe calls for 3 scoops of mix for 2 gallons, how do you find out how many gallons can be made with more scoops?

Back

Use the ratio: (scoops available / scoops needed) * gallons made.

Front

What is a rate?

Back

A rate is a specific kind of ratio that compares two different units, such as miles per hour.

Front

How do you find the number of items based on a ratio?

Back

Multiply the total number of items by the ratio fraction.

Front

What is the formula for finding the unit rate?

Back

Unit Rate = Total Quantity / Number of Units.

Front

If a car travels 210 miles in 3 hours, what is its speed in miles per hour?

Back

Speed = Distance / Time = 210 miles / 3 hours = 70 miles per hour.

Front

How do you convert a fraction to a percent?

Back

Multiply the fraction by 100 and add a percent sign.

Front

What is the relationship between ratios and proportions?

Back

Proportions state that two ratios are equal.

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