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Lesson 1.4 – Least Common Multiple (LCM) Standard: N.S. 2.4 – Determine the least common multiple and the greatest common divisor of a whole number; use them to solve problems with fractions. Objective: Students will be able to identify the least common multiple between two numbers. Vocabulary: Multiple – The product of a number and any counting number Common multiple – A multiple that is shared by two or more numbers Least Common Multiple (LCM) – The smallest number of common multiples of two numbers. Example 1: Make a list Find the LCM of 5, 6 Step 1: Make a list of the multiples of each number Step 2: Stop when you reach a multiple that the two share. Example 2: Use Prime Factorization to find the LCM Find the LCM of 75, 60 & 40 Step 1: Find the Prime factorization of each number. Write as an exponent Step 2: Circle the greatest power of every prime factor Step 3: Multiply the circled powers Whiteboard – CFU Find the LCM 1.) 12, 18 2.) 3,4 3.) 6, 11, 18 4.) 7, 20, 35 5.) 84, 360 6.) 39, 52,169