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Unformatted text preview: 1 FINDING THE LCM AND GCF LCM Least Common Multiple GCF Greatest Common Factor LCM is the smallest multiple that two or more numbers share. 2 3 4 5 6 4 8 12 16 20 24 The LCM is 20 here 10 20 30 40 50 60 GCF is the greatest factor that two or more numbers share. 4's factors are 1, 2, 4 10's factors are 1,2,5,10 The GCF here is 2. How to find the GCF and LCM 1. Divide out the numbers they have in common. 18 24 2 9 12 3 GCF= The product of the common factors= 6 3 2 3 4 LCM= All of the outside numbers = 2 3 4 3 = 72 100 40 GCF= The product of the common factors=______= LCM= All of the outside numbers =____________= This method works all the time with two numbers. It will not work all the time with more than two numbers you will have to think. Find the GCF and LCM for the following: 1) 18 8 2) 36 64 3) 18 45 4) 9 7 2 3 2 Fractions 2 thirds 2 out of 3 2 over 3 2 divided by 3 4 1 4 2 4 3 4 4 6 1 6 2 6 3 6 4 6 5 6 6 Accurately shade the following: 2 1 4 2 6 3 8 4 3 We call the previous fractions__________________________________________________. 2 2 3 3 4 4 5 5 1 2 1 2 1 2 1 2 1 1 3 1 3 1 3 1 3 1 1) find 8 15 inches, 4 1 inches, 16 4 inches, 16 20 inches, 2 7 inches 4 3 person group warm up. 1) Which fraction represents the shaded bar the best? a) 5/6 b) 2/15 c) 2/5 2 ) Which fraction represents the shaded bar the best? a) 3/7 b) 11/13 c) 3/19 3) Find the matching equivalent fractions. 4) Find three equivalent fractions for ....
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This note was uploaded on 01/13/2012 for the course MATH 30 taught by Professor Ianmccance during the Spring '12 term at Harvard.
 Spring '12
 IanMcCance

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