Ratios and Proportions

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

What is a proportion?

Back

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

Front

How do you find the perimeter of a polygon?

Back

To find the perimeter of a polygon, add the lengths of all its sides.

Front

If a garden has side lengths of 8 inches and is a regular pentagon, what is the formula for its perimeter?

Back

Perimeter = 5 * side length = 5 * 8 inches = 40 inches.

Front

What is the constant of proportionality?

Back

The constant of proportionality is the ratio between two quantities that are directly proportional to each other.

Front

How do you calculate the constant of proportionality from a given situation?

Back

Divide the output value by the input value to find the constant of proportionality.

Front

If 150 gallons of water are filled in 6 minutes, what is the rate of filling water?

Back

Rate = Total gallons / Total minutes = 150 gallons / 6 minutes = 25 gallons per minute.

Front

What is the formula to find time when filling a pool at a constant rate?

Back

Time = Total volume / Rate of filling.

Front

If Pasha bought 3 pounds of onions for $2.67, how do you find the cost per pound?

Back

Cost per pound = Total cost / Total pounds = $2.67 / 3 pounds = $0.89 per pound.

Front

What is a unit rate?

Back

A unit rate is a ratio that compares a quantity to one unit of another quantity.