Solving Proportions

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 two ratios and set the products equal to each other.

Front

What does it mean to find a percentage of a number?

Back

Finding a percentage of a number means calculating how much that percentage represents out of the total number.

Front

How do you calculate 30% of a number?

Back

To calculate 30% of a number, multiply the number by 0.30.

Front

If a baseball cap costs $30 and is on sale for 30% off, how do you find the sale price?

Back

To find the sale price, calculate 30% of $30 and subtract that amount from $30.

Front

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

Back

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

Front

How do you determine how many items you can buy with a certain amount of money?

Back

Divide the total amount of money by the price of one item.

Front

What is the relationship between distance, speed, and time?

Back

The relationship is described by the formula: Distance = Speed x Time.

Front

If a car travels 120 miles in 3 hours, what is its speed?

Back

Speed = Distance / Time = 120 miles / 3 hours = 40 miles per hour.

Front

How do you find the time it takes to travel a certain distance at a constant speed?

Back

Use the formula: Time = Distance / Speed.