Midterm Review Part 2-Calculator (Regular)

Front

What is the formula to calculate a percentage of a number?

Back

To find a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 12% of 40, calculate 40 * 0.12 = 4.8.

Front

How do you convert a decimal to a percent?

Back

To convert a decimal to a percent, multiply the decimal by 100 and add a percent sign. For example, 0.4 * 100 = 40%.

Front

What is sales tax and how is it calculated?

Back

Sales tax is a percentage added to the price of goods or services. To calculate the total cost including sales tax, multiply the original price by the sales tax rate and add it to the original price.

Front

What is an equivalent ratio?

Back

An equivalent ratio is a ratio that expresses the same relationship between two quantities. For example, 5:8 and 15:24 are equivalent ratios because they simplify to the same fraction.

Front

How do you find the unit rate?

Back

To find the unit rate, divide the quantity by the number of units. For example, if Justin types 408 words in 4 minutes, the unit rate is 408 ÷ 4 = 102 words per minute.

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 in terms of the number. For example, 12% of 40 is 4.8.

Front

How do you calculate the total cost including tax?

Back

To calculate the total cost including tax, add the sales tax to the original price. For example, if a sofa costs $599.99 and the tax is 6%, the total cost is $599.99 + ($599.99 * 0.06) = $635.99.

Front

What is the relationship between fractions and ratios?

Back

Fractions and ratios both compare two quantities. A ratio can be expressed as a fraction, and both can be simplified to show equivalent relationships.

Front

How do you simplify a ratio?

Back

To simplify a ratio, divide both terms by their greatest common factor. For example, to simplify 10:15, divide both by 5 to get 2:3.

Front

What is the process to find an equivalent ratio using multiplication?

Back

To find an equivalent ratio using multiplication, multiply both terms of the ratio by the same non-zero number. For example, for the ratio 5:8, multiplying both by 3 gives 15:24.