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Michigan GLCE: N.MR.04.27- Add and subtract fractions less that one with denominators through 12, and or 100, in cases where the denominators are equal or multiples of each other.
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## Christine Derkacz

on 20 April 2010

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#### Transcript of Adding/Subtracting Fractions

Adding and Subtracting Fractions and Simplest Form
1. Check for common denominator
ex: 2/5 +/- 1/5 ---> Common denominator
3/4 +/- 1/8 ---> Uncommon denominator
2. Find lmost common denominator of fractions w/ uncommon denominators

Add. ex: 3/4 + 1/8---> 4's Factors: 1*4, 2*2
8's Factors: 1*8, 2*4
2(3/4) = 2*3 , 2*4 = 6/8
New Problem---> 6/8 + 1/8

Sub. ex: 1/3 - 4/15---> 3's Factors: 1* 3
15's Factors: 1*15, 3*5
5(1/3) = 1*5 , 3*5 = 5/15
New Problem---> 5/15 + 4/15 4. Add the Numerators (top numbers) together, but keep the denominators the same
Add ex: 6/8 + 1/8 = 7/8
Sub ex: 5/15 + 4/15 = 9/15 **REMEMBER: WHAT EVER YOU DO TO THE TOP YOU MIUST DO TO THE BOTTOM, AND VICE-VERSA** 5. SIMPLIFY YOUR ANSWER!!! STEP 1- find any common multiples
ex: 9/15---> 9's Multiples: 1,3,9
15's Multiples: 1,3,5,15
COMMON MULTIPLE= 3 STEP 2- divide fraction (numerator and denominator) by the common multiple
ex: 9/15 / 3---> 9/3= 3 , 15/3= 5