Proportions and ratios, oh my!

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 solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the unknown variable.

Front

What is the constant of proportionality?

Back

The constant of proportionality is the constant value (k) that relates two proportional quantities, often represented as y = kx.

Front

If 3 apples cost $6, what is the cost of 1 apple?

Back

$2

Front

If 5 phones earn $215, how much does 1 phone earn?

Back

$43

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 slope.

Front

What is the formula for finding a ratio?

Back

The formula for finding a ratio is: Ratio = Part/Whole.

Front

If a recipe requires 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

Back

The ratio of flour to sugar is 2:3.

Front

How can you tell if two ratios are equivalent?

Back

Two ratios are equivalent if their cross products are equal.