Calculating Percents

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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 '%'. For example, 5% means 5 out of 100.

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How do you convert a percent to a decimal?

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To convert a percent to a decimal, divide the percent by 100. For example, 5% as a decimal is 0.05 (5 ÷ 100).

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What is the formula to calculate the percent of a number?

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The formula to calculate the percent of a number is: (Percent / 100) × Total = Part. For example, to find 20% of 50, calculate (20 / 100) × 50 = 10.

Tags

CCSS.6.RP.A.3C

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How do you calculate the sale price after a discount?

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To calculate the sale price after a discount, subtract the discount amount from the original price. For example, if an item costs $100 and has a 20% discount, the discount is $20, so the sale price is $100 - $20 = $80.

Tags

CCSS.6.RP.A.3C

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What is simple interest?

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Simple interest is calculated on the principal amount only. The formula is: Interest = Principal × Rate × Time. For example, if you borrow $1,000 at a 5% interest rate for 3 years, the interest is $1,000 × 0.05 × 3 = $150.

Tags

CCSS.7.RP.A.3

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How do you calculate the total cost including tax?

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To calculate the total cost including tax, first find the tax amount by multiplying the original price by the tax rate, then add the tax amount to the original price. For example, if an item costs $50 and the tax rate is 8%, the tax is $4, so the total cost is $50 + $4 = $54.

Tags

CCSS.6.RP.A.3C

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What is the formula for percent increase?

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The formula for percent increase is: ((New Value - Old Value) / Old Value) × 100. For example, if enrollment increases from 200 to 250, the percent increase is ((250 - 200) / 200) × 100 = 25%.

Tags

CCSS.6.RP.A.3C

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How do you find the total amount after a tip is added?

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To find the total amount after a tip is added, calculate the tip amount based on the total before the tip, then add the tip to the original total. For example, if the bill is $40 and the tip is 15%, the tip is $6, so the total is $40 + $6 = $46.

Tags

CCSS.6.RP.A.3C

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What is the relationship between fractions and percents?

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Fractions and percents are two ways to represent the same concept. A percent is a fraction with a denominator of 100. For example, 25% is equivalent to the fraction 25/100.

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How do you calculate the interest earned on an investment?

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To calculate the interest earned on an investment, use the formula: Interest = Principal × Rate × Time. For example, if you invest $2,000 at a 4% interest rate for 5 years, the interest earned is $2,000 × 0.04 × 5 = $400.

Tags

CCSS.7.RP.A.3