body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

Dashboard

Pearson Algebra 1 Common Core, 2011 View details

3. Dividing Polynomials

Finish the assignment

Continue to next subchapter

Exercise 69 Page 683

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

- 1/12

Practice makes perfect

When adding or subtracting fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators. 1/4 - 1/3Notice that 4 and 3 do not have a common factor greater than 1. Let's multiply the numerator and denominator of the first fraction by 3 and the numerator and denominator of the second fraction by 4 to create a common denominator.

1/4-1/3

ExpandFrac

a/b=a * 3/b * 3

1 * 3/4 * 3 - 1/3

ExpandFrac

a/b=a * 4/b * 4

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

Multiply

3/12 - 4/12

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

3/12 - 4/12

SubFrac