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Big Ideas Math: Modeling Real Life, Grade 7

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Big Ideas Math: Modeling Real Life, Grade 7 View details

4. Percents of Increase and Decrease

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Exercise 7 Page 257

Create a common denominator by multiplying both the numerator and denominator of 34 by 3.

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Practice makes perfect

When adding or subtracting fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators. - 5/12 + 3/4Since 12 is a multiple of 4, we can multiply both the numerator and denominator of 34 by 3 to create a common denominator.

- 5/12+ 3/4

a/b=a * 3/b * 3

- 5/12+ 3 * 3/4 * 3

Multiply

- 5/12+ 9/12

Now that we have a common denominator, we can proceed to simplifying the expression.

- 5/12+ 9/12

MoveNegFracToNum

Put minus sign in numerator

- 5/12+ 9/12

Add fractions

- 5+9/12

Add terms

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a/b=.a /4./.b /4.

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Subchapter links

Try It p.254-255

Self-Assessment for Concept & Skills p.255

Self-Assessment for Problem Solving p.256

Review & Refresh p.257

Concept, Skills, & Problem Solving p.257-258