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McGraw Hill Glencoe Algebra 2, 2012

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McGraw Hill Glencoe Algebra 2, 2012 View details

5. Operations with Radical Expressions

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Exercise 87 Page 421

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

5/12

Practice makes perfect

When adding or subtracting fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators. 2/3 - 1/4Since 12 is a multiple of both 3 and 4, we can multiply both the numerator and denominator of 23 by 4 and the numerator and denominator of 14 by 3 to create a common denominator.

2/3-1/4

a/b=a * 4/b * 4

2 * 4/3 * 4-1/4

a/b=a * 3/b * 3

2 * 4/3 * 4-1 * 3/4 * 3

Multiply

8/12-3/12

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

8/12-3/12

Subtract fractions

8-3/12

Subtract terms

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Subchapter links

Check Your Understanding p.419

Practice and Problem Solving p.419-420

H.O.T. Problems p.420

Standardized Test Practice p.421

Spiral Review p.421

Skills Review p.421