Unit 2 Review-Rates, Ratios, & Percents

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together. It expresses how many units of one quantity correspond to one unit of another quantity.

Front

How do you calculate the unit rate?

Back

To calculate the unit rate, divide the total quantity of one item by the total quantity of another item. For example, if a store has 120 customers in 8 hours, the unit rate is 120 ÷ 8 = 15 customers per hour.

Front

What is a ratio?

Back

A ratio is a relationship between two numbers indicating how many times the first number contains the second. It can be expressed in various forms, such as fractions, decimals, or with a colon (e.g., 3:5).

Front

How do you simplify a ratio?

Back

To simplify a ratio, divide both terms of the ratio by their greatest common divisor (GCD). For example, to simplify the ratio 12:20, divide both by 4 to get 3:5.

Front

What is a percent?

Back

A percent is a way of expressing a number as a fraction of 100. It is denoted by the symbol '%'. For example, 50% means 50 out of 100.

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 50% of 90, calculate 90 × 0.50 = 45.

Front

What is the formula to find the percentage of correct answers?

Back

The formula to find the percentage of correct answers is: (Number of correct answers ÷ Total number of questions) × 100.

Front

If Sally got 22 questions wrong on a quiz of 40 questions, how do you find the percentage of questions she got wrong?

Back

To find the percentage of questions Sally got wrong, use the formula: (22 ÷ 40) × 100 = 55%.

Front

What does it mean for two ratios to be equivalent?

Back

Two ratios are equivalent if they represent the same relationship between quantities. For example, the ratios 2:3 and 4:6 are equivalent.

Front

How do you find an equivalent ratio?

Back

To find an equivalent ratio, you can multiply or divide both terms of the ratio by the same non-zero number. For example, to find an equivalent ratio of 3:5, multiply both by 2 to get 6:10.