1. Lesson 4-3

2. Rewrite the problem with equivalent fractions List the multiples of both denominators. Find the least common multiple (LCM). Write new fractions with the LCM as the new denominator. Find the factor you multiply by to get from your original denominator to your new denominator. Use that same factor, and multiply it by your original numerator to get a new numerator.

3. WHAT DOES THAT MEAN? Let’s illustrate the steps with an example. 3 4 + 1 6

4. 3 4 + 1 6 Multiples of 4: 4, 8, 12, 16, 20 Multiples of 6: 6, 12, 18, 24, 30 + 12 x 3 9 x 2 2 12 11

5. Example 2 9 10 2 5 10, 20, 30, 40, 50 5, 10, 15, 20, 25 10 x 1 9 x 2 4 = 10 5 = 1 2

6. Classwork: Try this interactive site that guides you through solving addition and subtraction problems with fractions: Interactive Site Then try out this Action Fraction Game to help you practice. Homework Time p. 182, 1-51 ODD Interactive SiteAction Fraction Game