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2-2 Translate Between Words and Math

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Warm UpWarm Up

Lesson PresentationLesson Presentation

Problem of the DayProblem of the Day

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x

Warm UpEvaluate each expression for x = 9.

1. 7 + x

2. 4x

3. 2x + 1

4. 36

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Problem of the Day

Draw a square around the numbers of four adjacent days on the calendar for this month. Add all the numbers in the square and subtract four times the first number. What number do you get?

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Learn to translate between words and math.

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In word problems, you may need to translate words to math.

Action Operation

Put together or combine

Find how much more or less

Put together groups of equal parts

Separate into equal groups

Add

Subtract

Multiply

Divide

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Lake Superior is the largest lake in North America. Let a stand for the area in square miles of Lake Superior. Lake Erie has an area of 9,910 square miles. Write an expression to show how much larger Lake Superior is than Lake Erie.

Additional Example 1A: Social Studies Application

To find how much larger, subtract the area of Lake Erie from the area of Lake Superior.

a – 9,910

Lake Superior is a – 9,910 square miles larger than Lake Erie.

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Let p represent the number of colored pencils in a box. If there are 26 boxes on the shelf, write an algebraic expression to represent the total number of pencils on the shelf.

Additional Example 1B

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The Nile River is the world’s longest river. Let n stand for the length in miles of the Nile. The Paraná River is 3,030 miles long. Write an expression to show how much longer the Nile is than the Paraná.

Check It Out: Example 1A

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Check It Out: Example 1B

Let p represent the number of paper clips in a box. If there are 125 boxes in a case, write an algebraic expression to represent the total number of paper clips in a case.

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37 + 28

• 28 added to 37

• 37 plus 28

• the sum of 37 and 28

• 28 more than 37

• 28 added to x

• x plus 28

• the sum of x and 28

•28 more than x

x + 28

++Operation

Numerical Expression

Words

Algebraic Expression

Words

There are several different ways to write math expressions with words.

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• 12 subtracted from k

• 12 minus k

• the difference of k and 12

• take away 12 from k

k — 12

Operation


Words


Words

90 — 12

• 12 subtracted from 90• 90 minus 12• the difference of 90 and 12• 12 less than 90• take away 12 from 90

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• 8 times w• w multiplied by 8• the product of 8 and w• 8 groups of of w

8 w or (8)(w) or 8w

Operation


Words


Words

8 48 or 8 48

• 8 times 48• 48 multiplied by 8• the product of 8 and 48

or (8)(48) or

8(48) or (8)48

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• n divided by 3

• the quotient of n and 3

n 3 or

Operation


Words


Words

327 3 or

• 327 divided by 3• the quotient of 327 and 3

3273

n3

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Write each phrase as a numerical or algebraic expression.

Additional Example 2: Translating Words into Math

A. 987 minus 12

B. x times 45

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Write each phrase as a numerical or algebraic expression.

Check It Out: Example 2

A. 42 less than 79

B. y divided by 22

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Write two phrases for each expression.

Additional Example 3: Translating Math into Words

A. 16

B. (75)(32)

b__

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Write two phrases for each expression.

Check It Out: Example 3

A. 17 – 14

B. 12c

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1. Let x represent the number of minutes Kristen works out in one week. Write an expression for the number of minutes she works out in 4 weeks.

Lesson Quiz

Write each phrase as a numerical or algebraic expression. 2. 7 less than x

3. The product of 12 and w

Write a phrase for each expression. 4. 17 + x

5. n 12

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