Unit 3 Unit Rates and Percentages 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 5 pounds of apples cost $10, the unit rate is $2 per pound.

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How do you calculate the cost of multiple items given a unit price?

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To calculate the cost of multiple items, multiply the unit price by the number of items. For example, if apples cost $1.50 per pound and you buy 9.5 pounds, the cost is $1.50 x 9.5 = $14.25.

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What is the formula to find the unit rate?

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The formula to find the unit rate is: Unit Rate = Total Cost / Number of Units. For example, if you spend $40 on 5 pounds of concrete, the unit rate is $40 / 5 = $8 per pound.

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How do you find the number of items per group?

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To find the number of items per group, divide the total number of items by the number of groups. For example, if there are 125 students and 5 buses, the number of students per bus is 125 / 5 = 25.

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What is a better buy when comparing two different pack sizes?

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To determine the better buy, calculate the cost per item for each pack size. The pack with the lower cost per item is the better buy. For example, if an 8 pack costs $4.79, the cost per juice box is $4.79 / 8 = $0.59875, and for a 12 pack costing $6.59, it's $6.59 / 12 = $0.54917.

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How do you calculate the price of one item from a bulk purchase?

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To calculate the price of one item from a bulk purchase, divide the total cost by the number of items. For example, if you buy 20 apples for $10.00, the price of one apple is $10.00 / 20 = $0.50.

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What is the relationship between percentages and unit rates?

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Percentages can be converted to unit rates by expressing the percentage as a fraction of 100. For example, 25% can be expressed as 25/100 or 0.25.

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How do you convert a fraction to a percentage?

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To convert a fraction to a percentage, divide the numerator by the denominator and then multiply by 100. For example, 1/4 = 0.25 x 100 = 25%.

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What is the importance of understanding unit rates in real life?

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Understanding unit rates helps consumers make informed decisions about purchases, compare prices, and evaluate the best value for money.

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How can you use unit rates to compare different products?

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You can use unit rates to compare different products by calculating the cost per unit for each product and choosing the one with the lower cost per unit.