Rates, Ratios, proportions and percents

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other.

Front

What is a rate?

Back

A rate is a specific kind of ratio that compares two different units, such as miles per hour or price per item.

Front

What is a unit rate?

Back

A unit rate is a rate in which the second quantity is one unit, such as 60 miles per hour.

Front

How do you convert a percent to a decimal?

Back

To convert a percent to a decimal, divide the percent by 100. For example, 25% = 25 ÷ 100 = 0.25.

Front

What is 25% of 80?

Back

20

Front

How do you find a percentage of a number?

Back

Multiply the number by the percentage (as a decimal). For example, to find 30% of 50, calculate 50 × 0.30 = 15.

Front

What is the formula for finding a percent?

Back

Percent = (Part/Whole) × 100.

Front

What does the term 'proportion' mean?

Back

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

Front

If 3/4 of a class are girls, what percent of the class are girls?

Back

75%.

Front

What is the relationship between ratios and fractions?

Back

Ratios can be expressed as fractions, where the first quantity is the numerator and the second quantity is the denominator.