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McGraw Hill Glencoe Algebra 1, 2012

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McGraw Hill Glencoe Algebra 1, 2012 View details

2. Order of Operations

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Exercise 80 Page 15

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

19/4

Practice makes perfect

Before we can evaluate a sum or difference involving mixed numbers, the mixed numbers must first be rewritten as fractions.

a bc	a* c+b/c	Simplify
1 112	1*12+1/12	13/12
3 23	3*3+2/3	11/3

When adding or subtracting fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators. 13/12 + 11/3 Since 12 is a multiple of 3, we can multiply both the numerator and denominator of 113 by 4 to create a common denominator.

13/12+11/3

a/b=a * 4/b * 4

13/12+11 * 4/3 * 4

Multiply

13/12+44/12

Add fractions

13+44/12

Add terms

57/12

a/b=.a /3./.b /3.

19/4

Subchapter links

Check Your Understanding p.12

Practice and Problem Solving p.13-14

H.O.T. Problems p.14

Standardized Test Practice p.15

Spiral Review p.15

Skills Review p.15