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Pearson Algebra 1 Common Core, 2011

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Pearson Algebra 1 Common Core, 2011 View details

4. Properties of Real Numbers

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Exercise 68 Page 28

To subtract fractions, they need to have the same denominator.

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Practice makes perfect

To subtract fractions, they need to have the same denominator. In this exercise, we have two fractions with different denominators. 5/9-5/10In order to create a common denominator, we can multiply the numerator and denominator in 59 by 10, and by 9 in 510.

5/9-5/10

a/b=a * 10/b * 10

5* 10/9* 10-5/10

a/b=a * 9/b * 9

5* 10/9* 10-5* 9/10* 9

Multiply

50/90-45/90

Now that they have the same denominator, they can be subtracted.

50/90-45/90

Subtract fractions

50-45/90

Subtract terms

5/90

a/b=.a /5./.b /5.

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Subchapter links

Lesson Check p.26

Practice and Problem-Solving Exercises p.26-28

Standardized Test Prep p.28

Mixed Review p.28