Proportions and Percents

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What is a proportion?

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A proportion is an equation that states that two ratios are equal. For example, if a/b = c/d, then a, b, c, and d are in proportion.

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What is a percent?

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A percent is a ratio expressed as a fraction of 100. It is often used to compare a number to a whole.

Front

How do you calculate a percentage of a number?

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To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 30% of 60, calculate 60 * 0.30 = 18.

Front

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

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Total Amount = Original Price + (Original Price * Tax Rate). For example, for a $1,000 car with a 5% tax, Total Amount = 1000 + (1000 * 0.05) = $1,050.

Front

How do you convert a fraction to a percent?

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What is the relationship between fractions, decimals, and percents?

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Front

How do you find what percent one number is of another?

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Front

What is the cross-multiplication method in proportions?

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Front

How do you set up a proportion to solve a problem?

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Front

What is the formula for finding the percent increase?

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