9) 12 and 36 10) 10 and 20 11) 10, 20, and 40 12) 9, 18, and 36 13) 2, 5, and 6 14) 2, 3, and 8 15) 3, 5, and 6 16) 4, 5, and 10 Find the least common multiple of each group of numbers by fi rst making a list of multiples of the larger number. 17) 3 and 7 18) 5 and 9 19) 12 and 20 20) 10 and 15 21) 15 and 25 22) 16 and 24 23) 3, 5, and 10 24) 3, 12, and 18 25) 4, 9, and 24 26) 6, 15, and 25 27) 4, 5, 8, and 10 28) 3, 5, 6, and 10 29) 6, 8, 9, and 15 30) 4, 6, 10, and 36 Determine whether each statement is always, sometimes, or never true. 31) The LCM of two different prime numbers is the product of the two numbers. 32) The LCM of two different prime numbers is a prime number. 33) The LCM of two numbers is the product of the two numbers. 34) The LCM of two even numbers is even. 35) The LCM of two different odd numbers is odd. 36) The LCM of an even number and an odd number is odd. Objective 2: Find the LCM Using Prime Factorization Find the LCM of each group of numbers using prime factorization. 37) 7 and 28 38) 8 and 56 39) 8 and 20 40) 9 and 15 41) 12 and 54 42) 16 and 28 43) 50 and 60 44) 45 and 54 45) 6, 9, and 15 46) 6, 16, and 18 47) 2, 5, and 11 48) 2, 5, and 17 49) 8, 24, and 32 50) 9, 21, and 30 51) 3, 4, 9, and 12 52) 2, 3, 6, and 8 53) 12, 28, 54, and 126 54) 9, 12, 50, and 60 R1) Do you know how to use the different methods for fi nding the least common multiple? R2) Would you be able to complete exercises similar to those you just fi nished without any help or notes? 234 CHAPTER 4 Adding and Subtracting Fractions www.mhhe.com/messersmith
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