Rates, unit rates, conversions

Front

What is a rate?

Back

A rate is a ratio that compares two different quantities, often expressed as a fraction. For example, speed is a rate that compares distance to time.

Front

What is a unit rate?

Back

A unit rate is a rate in which the second quantity is one. For example, if a car travels 300 miles in 5 hours, the unit rate is 60 miles per hour.

Front

How do you calculate the price per share of stock?

Back

To find the price per share, divide the total cost by the number of shares. For example, if 30 shares cost $205.50, the price per share is $205.50 ÷ 30 = $6.85.

Front

What is the formula to find hourly pay?

Back

Hourly pay can be calculated by dividing total earnings by the number of hours worked. For example, if Melanie earns $70 for 8 hours, her hourly rate is $70 ÷ 8 = $8.75.

Front

How do you find the total number of chocolate donuts if you know the total and the number of plain donuts?

Back

Subtract the number of plain donuts from the total donuts. For example, if there are 300 donuts and 80 are plain, then 300 - 80 = 220 chocolate donuts.

Front

What is the conversion factor from miles to kilometers?

Back

1 mile is approximately equal to 1.6 kilometers.

Front

How do you convert kilometers per hour to miles per hour?

Back

To convert kilometers per hour to miles per hour, divide the speed in kilometers by 1.6. For example, 65 kph ÷ 1.6 = 40.625 mph.

Front

What is the approximate conversion from inches to centimeters?

Back

2 inches is approximately equal to 5 centimeters.

Front

How do you convert height from inches to centimeters?

Back

To convert height from inches to centimeters, multiply the height in inches by 2.54. For example, 66 inches × 2.54 = 167.64 cm.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal. For example, if a/b = c/d, then a, b, c, and d are in proportion.