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10 LCM using Primes. Prime Factor: 12 12 = 2 x 2 x 3 Prime Factor: 20 20 = 2 x 2 x 5. 12 = 2 x 2 x 3. LCM(12,20) =. What’s left behind?. 20 = 2 x 2 x 5. Make common pairs. 2. x. 2. x. 3. x. 5. = 60. GCF. LCM. Example. 12 = 2 x 2 x 3. LCM(12,18) =. What’s left behind?.
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10 LCM using Primes Prime Factor: 12 12 = 2 x 2 x 3 Prime Factor: 20 20 = 2 x 2 x 5
12 = 2 x 2 x 3 LCM(12,20) = What’s left behind? 20 = 2 x 2 x 5 Make common pairs 2 x 2 x 3 x 5 = 60 GCF LCM
Example 12 = 2 x 2 x 3 LCM(12,18) = What’s left behind? 18 = 2 x 3 x 3 Make common pairs 2 x 3 x 2 x 3 = 36 GCF LCM
Example 18 = 2 x 3 x 3 LCM(18,20) = What’s left behind? 20 = 2 x 2 x 5 Make common pairs 2 x 3 x 2 x 3 x 5 = 180 GCF LCM