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Published byByron Holland Modified over 8 years ago

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LET’S REVIEW! What Are Fractions?

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Let’s look at a pizza to understand more! 12 45 3 6

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Adding fractions So, now let’s add two fractions together! 6/6-1/6 =?

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Let’s do another! Look closely at this one! Try it on your own and then turn to your neighbor and see what they got! 1/2+ 1/7=?

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To solve this problem we need to find the….. Least Common Multiple (LCM) But how do we do this?

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Let’s go through all the factors for the Denominators 2: 2,4,6,8,10,12,14,16,18,20…. 7: 7,14,21,28,35,42,49… Do they have any numbers in common? Which is the least? (LCM) 14!

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So if we make the new denominator 14, we have to change the numerators too. Let’s do this together Old: 1/2+1/7 New: 7/14+ 2/14 Now we can solve this easily! What is the answer?

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Finding the LCM is key in solving fraction problems with unlike denominators! You use this method for subtracting fractions too! Let’s try more!

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1. 1/2+1/2=? 2. 3/4+2/5=? 3. 3/5-2/5=? 4. 6/7-1/3=?

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