Writing Expressions for Word Problems Involving Percents

This video tutorial teaches how to write expressions for problems involving percents. It outlines a step-by-step process: identifying variables, percents, and operations (addition or subtraction), converting percents to decimals, and writing expressions. The video provides hints for recognizing when to add or subtract, such as discounts indicating subtraction and tips indicating addition. Two example problems are solved: calculating a discount on a coffee pot and a tip on a restaurant bill, demonstrating how to apply the steps and combine like terms.

What is the first step in solving word problems involving percentages?

• Identify the variable

• Convert the percentage to a decimal

• Identify if adding or subtracting

• Read the problem

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CCSS.8.EE.C.7B

What does a discount in a store usually imply about the operation to be performed?

• Division

• Subtraction

• Addition

• Multiplication

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CCSS.7.RP.A.3

How do you convert a percentage to a decimal?

• Add 100

• Subtract 100

• Divide by 100

• Multiply by 100

In the example with Cassidy, what is the variable 'C' used to represent?

• The amount of the coupon

• The discount percentage

• The original price of the coffee pot

• The final price after discount

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CCSS.6.EE.B.6

What operation is used when applying a coupon in the example with Cassidy?

• Addition

• Subtraction

• Multiplication

• Division

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CCSS.3.OA.D.8

How is the expression for the final price after applying a coupon written?

• C + 0.30 * C

• C - 0.30 * C

• C / 0.30

• C * 1.30

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CCSS.6.EE.B.6

What does the variable 'B' represent in the problem about Darnay?

• The percentage of the tip

• The original bill amount

• The total bill after the tip

• The tip amount

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CCSS.6.EE.B.6

What operation is performed when adding a tip to the bill?

• Addition

• Subtraction

• Division

• Multiplication

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CCSS.5.NBT.B.7

How do you calculate the total bill including a tip?

• B + 0.18 * B

• B - 0.18 * B

• B * 1.18

• B / 1.18

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CCSS.6.RP.A.3B

What is the final expression for the bill including an 18% tip?

• 1.18 * B

• B + 18

• B - 0.18

• B / 1.18

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CCSS.7.EE.A.2

CCSS.HSA.SSE.A.2