Rates, Ratios, Percents, and Simple Interest

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 cost per item.

Front

What is a percent?

Back

A percent is a way of expressing a number as a fraction of 100, denoted by the symbol %.

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (as a decimal). For example, 20% of 50 is 50 * 0.20 = 10.

Front

What is simple interest?

Back

Simple interest is calculated using the formula: Interest = Principal x Rate x Time.

Front

If a class is 55% girls and has 20 girls, how many students are in the class?

Back

36 students.

Front

How many exhibits contain birds if 30% of 130 exhibits are birds?

Back

39 exhibits.

Front

What is the total bill including a 20% tip on a $28 meal?

Back

$33.60.

Front

What percent is shaded yellow if 1/4 of a shape is shaded?

Back

25%.

Front

What is the unit rate if a store sees 120 customers in 8 hours?

Back

15 customers per hour.