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Published byByron Holland
Modified over 7 years ago
LET’S REVIEW! What Are Fractions?
Let’s look at a pizza to understand more! 12 45 3 6
Adding fractions So, now let’s add two fractions together! 6/6-1/6 =?
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=?
To solve this problem we need to find the….. Least Common Multiple (LCM) But how do we do this?
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!
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?
Finding the LCM is key in solving fraction problems with unlike denominators! You use this method for subtracting fractions too! Let’s try more!
1. 1/2+1/2=? 2. 3/4+2/5=? 3. 3/5-2/5=? 4. 6/7-1/3=?
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