Proportions

Front

What is a proportion?

Back

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

Front

How do you set up a proportion to solve a problem?

Back

To set up a proportion, you can use the formula a/b = c/d, where a and b are the first ratio, and c and d are the second ratio.

Front

What is the cross-multiplication method in solving proportions?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio, and setting the two products equal to each other.

Front

If 3 pounds of hamburger meat cost $6, what is the cost per pound?

Back

The cost per pound is $2, calculated by dividing $6 by 3.

Front

How do you find the total cost when buying multiple items at a constant rate?

Back

Multiply the cost per item by the number of items purchased.

Front

What is the formula to estimate a population based on a sample?

Back

The formula is (number of items in sample / total sample size) = (number of items in population / total population size).

Front

How do you convert currency using an exchange rate?

Back

To convert currency, multiply the amount of money you have by the exchange rate.

Front

What is the relationship between volume and duration in using a product?

Back

The duration a product lasts is directly proportional to its volume, assuming usage rate remains constant.

Front

How do you calculate the cost for a different number of guests based on a known cost?

Back

Use the unit rate (cost per guest) to find the total cost for the new number of guests by multiplying the unit rate by the new number of guests.

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity per one unit.