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# Sec. 6.3

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### Sec. 6.3

1. 1. Learning Target:Students will learn how to compute the actual sums and differences of fractions with different denominators. <br />
2. 2. BIG IDEA:YOU MUST FIND COMMON DENOMINATORSthen follow the same rules as we did when we had fractions with common denominators to begin with.<br />
3. 3. Why is it so important to find a common denominator when adding and subtracting fractions?<br />
4. 4. A: so you can truly understand the relationship between your two fractions.<br />
5. 5. To find common denominators you can either find the LCD or you can us the method below.http://www.mathsisfun.com/numbers/common-denominator.html<br />
6. 6. Video of the method described on the last slide.http://www.mathsisfun.com/numbers/common-denominator.html<br />
7. 7. Find the sum or difference.3/4 + 2/35/6 + 7/107/8 – 1/41/2 – 4/9Remember to simplify your answer.<br />
8. 8. Find the sum or difference.3/4 + 2/3 = 1 5/125/6 + 7/10 = 1 8/15 7/8 – 1/4 = 5/81/2 – 4/9 = 1/18Remember to simplify your answer.<br />
9. 9. Evaluate the expression.2/3 + 1/3 + 3/71/4 + 1/6 – 1/311/12 – (1/4 + 1/6)<br />
10. 10. Evaluate the expression.2/3 + 1/3 + 3/7 = 1 3/71/4 + 1/6 – 1/3 = 1/1211/12 – (1/4 + 1/6) = 1/2<br />
11. 11. When in life will you ever add or subtract fractions?<br />
12. 12. A: Finding the perimeter of an object.CookingCarpentry workPharmacist Figuring how much gas you need to fill your gas tank.<br />
13. 13. Can you compute the actual sums and differences of fractions with different denominators?<br />