Proportions

Front

What is a proportion?

Back

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

Front

How do you solve for x in a proportion?

Back

To solve for x in a proportion, cross-multiply the terms and then isolate x.

Front

What is 75% expressed as a fraction?

Back

75% can be expressed as the fraction 3/4.

Front

If a car travels 420 miles in 8 hours, what is its speed in miles per hour?

Back

The speed is 52.5 miles per hour (420 miles ÷ 8 hours).

Front

How do you find a missing value in a proportion?

Back

Set up the proportion as a fraction and cross-multiply to find the missing value.

Front

What is the formula to find the percentage of a number?

Back

The formula is: (part/whole) x 100 = percentage.

Front

If 14 sticks of pepperoni are needed for 28 pizzas, how many sticks are needed for 1 pizza?

Back

1 stick of pepperoni is needed for 2 pizzas (14 sticks ÷ 28 pizzas).

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions show that two ratios are equal.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide by 100.

Front

If x/20 = 3/4, what is the value of x?

Back

x = 15 (cross-multiply and solve for x).