Proportions

Front

What is a proportion?

Back

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

Tags

CCSS.7.RP.A.2A

Front

How can you determine if two ratios form a proportion?

Back

Two ratios form a proportion if the cross products are equal.

Tags

CCSS.7.RP.A.2A

Front

What is the cross product of the ratios a/b and c/d?

Back

The cross product is ad and bc. If ad = bc, then a/b = c/d.

Front

What does it mean for a graph to be proportional?

Back

A graph is proportional if it is a straight line that passes through the origin.

Tags

CCSS.7.RP.A.2D

Front

What is the constant of proportionality?

Back

The constant of proportionality is the ratio between two proportional quantities, often represented as k in the equation y = kx.

Tags

CCSS.7.RP.A.2B

Front

If 3 oranges cost $12, what is the cost of 8 oranges?

Back

The cost of 8 oranges is $32.

Tags

CCSS.6.RP.A.3B

Front

What is the formula to find the missing value in a proportion?

Back

If a/b = c/d, then ad = bc. You can solve for the missing value using this equation.

Tags

CCSS.7.RP.A.2C

Front

What is an example of a proportional relationship in real life?

Back

An example is the relationship between distance and time when traveling at a constant speed.

Tags

CCSS.7.RP.A.2A

Front

What is the slope of a proportional graph?

Back

The slope of a proportional graph is equal to the constant of proportionality.

Tags

CCSS.8.EE.B.5

Front

If 5 kg of apples cost $15, how much do 2 kg cost?

Back

2 kg of apples cost $6.

Tags

CCSS.6.RP.A.3B