Ratios and Proportions

Front

What is a ratio?

Back

A ratio is a relationship between two numbers indicating how many times the first number contains the second.

Front

Provide a real-life example of a ratio.

Back

4 meatballs : 1 cup of sauce.

Front

How do you calculate the cost of multiple items based on a given price?

Back

To find the cost of multiple items, multiply the price of one item by the number of items.

Front

If four ice creams cost $3.20, what would 8 ice creams cost?

Back

$6.40.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How can you determine if two ratios form a proportion?

Back

Cross-multiply the ratios; if the products are equal, the ratios are proportional.

Front

What is the formula for finding the unit rate?

Back

Unit rate = quantity of one item / quantity of another item.

Front

If a bird flies 35 meters in 10 seconds, what is its speed in meters per second?

Back

Speed = distance/time = 35 meters / 10 seconds = 3.5 meters per second.

Front

How long will it take a bird flying at 3.5 meters per second to fly 14 meters?

Back

Time = distance/speed = 14 meters / 3.5 meters per second = 4 seconds.

Front

What is the ratio of red apples to green apples if there are 4 red apples and 3 green apples?

Back

The ratio is 4 red apples to 3 green apples.