Proportions

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

To determine if two ratios form a proportion, cross-multiply and see if the products are equal.

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

What does it mean if a graph is proportional?

Back

A graph is proportional if it passes through the origin (0,0) and has a constant rate of change.

Front

What is a non-proportional graph?

Back

A non-proportional graph does not pass through the origin and does not have a constant rate of change.

Front

Give an example of a proportional relationship.

Back

An example of a proportional relationship is the relationship between distance and time at a constant speed.

Front

What is the constant of proportionality?

Back

The constant of proportionality is the ratio between two proportional quantities.

Front

How can you identify a proportional relationship in a table of values?

Back

A proportional relationship in a table of values will have equivalent ratios for each pair of values.

Front

What is the formula for finding a missing value in a proportion?

Back

The formula is a/b = c/d, where you can find the missing value by cross-multiplying.

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.