ratios and proportions

Front

What is a ratio?

Back

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

Front

How do you simplify a ratio?

Back

To simplify a ratio, divide both terms by their greatest common divisor (GCD).

Front

What is a proportion?

Back

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

Front

How do you determine if two ratios form a proportion?

Back

Cross-multiply the ratios. If the products are equal, the ratios form a proportion.

Front

What is the unit rate?

Back

The unit rate is a comparison of a quantity to one unit of another quantity, often expressed as 'per'.

Front

How do you find the cost per unit?

Back

To find the cost per unit, divide the total cost by the number of units.

Front

If there are 4 birds and 6 snakes, what is the ratio of birds to snakes?

Back

4/6 or 2/3 when simplified.

Front

If you spend $40 on 5 pounds of concrete, what is the unit rate in dollars per pound?

Back

$8 per pound.

Front

If Gracie has 24 cookies for 3 classes, how many cookies should she bring for 4 classes?

Back

32 cookies.

Front

What is the first step in solving a ratio problem?

Back

Identify the quantities being compared and express them as a ratio.