Percents and expressions

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 '%'.

Front

How do you calculate the sales tax on a purchase?

Back

To calculate sales tax, multiply the purchase price by the sales tax rate (as a decimal). For example, for an 8% tax on a $100 purchase: $100 * 0.08 = $8.

Front

What does it mean to add sales tax to a price?

Back

Adding sales tax means increasing the original price by the amount of tax calculated. For example, if an item costs $50 and the tax is $4, the total cost is $54.

Front

What is the formula to find the total cost after tax?

Back

The total cost after tax can be calculated using the formula: Total Cost = Original Price + (Original Price * Tax Rate).

Front

What is a discount?

Back

A discount is a reduction in the price of a product or service, often expressed as a percentage of the original price.

Front

How do you calculate the final price after applying a discount?

Back

To calculate the final price after a discount, subtract the discount amount from the original price. Final Price = Original Price - Discount Amount.

Front

What does it mean to subtract a discount from a price?

Back

Subtracting a discount means reducing the original price by the amount of the discount, resulting in a lower final price.

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (like +, -, *, /) that represents a value.

Front

How do you simplify the expression 6(2x - 3)?

Back

To simplify, distribute the 6: 6 * 2x - 6 * 3 = 12x - 18.

Front

What is the relationship between percentages and decimals?

Back

Percentages can be converted to decimals by dividing by 100. For example, 25% = 0.25.