Chapter 3 - Adding and Subtracting Fractions - Review Exercises - Page 253: 16

180

15 , 9, 20 Use prime factorization to find the least common multiple of 15 , 9 and 20 Find the prime factorization for each number 15 = 3 * 5 9 = 3 * 3 20 = 2 * 2 * 5 3 and 5 occur most often in the factorization of 15 3 occur most often in the factorization of 9 2 * 2 occur most often in the factorization of 20 L.C.M. = 3 * 5 *3 *2 *2 = 180