Rates and Percents Review

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What is a unit rate?

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A unit rate is a comparison of two different quantities where one of the quantities is expressed as a quantity of one. For example, if a box of 35 diapers costs $6.99, the unit rate is the cost per diaper.

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How do you calculate the unit rate?

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To calculate the unit rate, divide the total cost by the number of items. For example, $6.99 ÷ 35 diapers = $0.20 per diaper.

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What is 150% of a number?

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150% of a number means you take the number and multiply it by 1.5. For example, 150% of $20 is $20 × 1.5 = $30.

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How do you find the cost per pound of an item?

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To find the cost per pound, divide the total cost by the weight in pounds. For example, for a 20-lb bag costing $23.44, the cost per pound is $23.44 ÷ 20 = $1.17.

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What is 30% of a number?

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To find 30% of a number, multiply the number by 0.30. For example, 30% of $20 is $20 × 0.30 = $6.

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How do you calculate a percentage of a total?

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To calculate a percentage of a total, multiply the total by the percentage (in decimal form). For example, to find 50% of $148, calculate $148 × 0.50 = $74.

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What does it mean to save a percentage of your paycheck?

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Saving a percentage of your paycheck means setting aside that portion of your earnings for future use. For example, saving 50% of a $148 paycheck means saving $74.

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What is the formula for finding the total cost of multiple items?

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The total cost can be found by multiplying the number of items by the cost per item. For example, if one diaper costs $0.20, then 35 diapers cost 35 × $0.20 = $7.00.

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How do you compare costs of different sizes of items?

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To compare costs, calculate the cost per unit (e.g., per pound or per item) for each size and then compare those values.

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What is the importance of understanding rates and percents?

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Understanding rates and percents is important for making informed financial decisions, such as budgeting, shopping, and saving.