Ratios and Proportions

Front

What is a proportion?

Back

When two ratios are equivalent and show the same value.

Front

Solve for x: 5/10 = x/20

Back

x = 10.

Front

If two triangles are similar, what does that mean?

Back

Their corresponding angles are equal and their corresponding sides are in proportion.

Front

Pat needs 14 sticks of pepperoni to make 28 pizzas. How many sticks of pepperoni are needed to make 36 pizzas?

Back

18 sticks.

Front

What is a ratio?

Back

A comparison of two quantities by division.

Front

Solve the proportion: 3/4 = x/16

Back

x = 12.

Front

If a recipe calls for 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

What is the cross-multiplication method used for?

Back

To solve proportions by multiplying the means and extremes.

Front

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

Back

$6.

Front

What is the scale factor in similar figures?

Back

The ratio of the lengths of corresponding sides.