7th Grade Math PSSA Review

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What is sales tax?

Back

Sales tax is a percentage of the sale price of goods or services that is collected by the seller and paid to the government.

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How do you calculate sales tax?

Back

To calculate sales tax, multiply the price of the item by the sales tax rate (as a decimal). For example, for a $100 item with a 5% tax rate: $100 x 0.05 = $5.

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What is the formula for average speed?

Back

Average speed is calculated by dividing the total distance traveled by the total time taken. Formula: Average Speed = Total Distance / Total Time.

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How do you convert seconds to minutes?

Back

To convert seconds to minutes, divide the number of seconds by 60.

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What is the total cost including tax?

Back

Total cost including tax = Original price + Sales tax.

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How do you find the percentage of a number?

Back

To find the percentage of a number, multiply the number by the percentage (as a decimal). For example, to find 20% of 50: 50 x 0.20 = 10.

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What is a linear equation?

Back

A linear equation is an equation that makes a straight line when graphed. It can be written in the form y = mx + b, where m is the slope and b is the y-intercept.

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How do you solve for x in an equation?

Back

To solve for x, isolate x on one side of the equation using inverse operations (addition, subtraction, multiplication, division).

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What does it mean to round to the nearest tenth?

Back

Rounding to the nearest tenth means looking at the hundredths place (the second digit after the decimal) and rounding up or down based on its value.

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What is the distributive property?

Back

The distributive property states that a(b + c) = ab + ac. It allows you to multiply a number by a sum.