ACTIVITY: Identifying Common Multiples
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1 1.6 Least Common Multiple of two numbers? How can you find the least common multiple 1 ACTIVITY: Identifying Common Work with a partner. Using the first several multiples of each number, copy and complete the Venn diagram. Identify any common multiples of the two numbers. a. 8 and 1 of 8 of 1 b. 4 and 14 of 4 of 14 c. 10 and 15 of 10 of 15 COMMON CORE Common In this lesson, you will use diagrams to identify common multiples. find least common multiples. Learning Standard 6.NS.4 d. 0 and 5 of 0 of 5 e. Look at the Venn diagrams in parts (a) (d). Explain how to identify the least common multiple of each pair of numbers. Then circle it in each diagram. 6 Chapter 1 Numerical Expressions and Factors
2 ACTIVITY: Interpreting a Venn Diagram of Factors Work with a partner. a. Write the prime factorizations of 8 and 1. Use the results to complete the Venn diagram. b. Repeat part (a) for the remaining number pairs in Activity 1. of 8 of 1 c. STRUCTURE Compare the numbers from each section of the Venn diagrams to your results in Activity 1. What conjecture can you make about the relationship between these numbers and your results in Activity 1? Math Practice Construct Arguments How can you use diagrams to support your explanation?. IN YOUR OWN WORDS How can you find the least common multiple of two numbers? Give examples to support your explanation. 4. The Venn diagram shows the prime of two numbers. 5 Use the diagram to do the following tasks. a. Identify the two numbers. b. Find the greatest common factor. c. Find the least common multiple. 5. A student writes the prime factorizations of 8 and 1 in a table as shown. She claims she can use the table to find the greatest common factor and the least common multiple of 8 and 1. How is this possible? 8 = 1 = 6. Can you think of another way to find the least common multiple of two or more numbers? Explain. Use what you learned about least common multiples to complete Exercises 5 on page 40. Section 1.6 Least Common Multiple 7
3 1.6 Lesson Lesson Tutorials that are shared by two or more numbers are called common multiples. The least of the common multiples is called the least common multiple (LCM). You can find the LCM of two or more numbers by listing multiples or using prime. EXAMPLE Key Vocabulary common multiples, p. 8 least common multiple, p. 8 1 Finding the LCM Using Lists of Find the LCM of 4 and 6. List the multiples of each number. of 4: 4, 8, 1, 16, 0, 4, 8,, 6,... Circle the common multiples. of 6: 6, 1, 18, 4, 0, 6,... Some common multiples of 4 and 6 are 1, 4, and 6. The least of these common multiples is 1. So, the LCM of 4 and 6 is 1. Exercises 6 11 Find the LCM of the numbers using lists of multiples. 1., 8. 9, 1. 6, 10 EXAMPLE Finding the LCM Using Factorizations Find the LCM of 16 and 0. Make a factor tree for each number Write the prime factorization of each number. Circle each different factor where it appears the greater number of times. 16 = appears more often here, so circle all s. 0 = 5 5 appears once. Do not circle the s again. 5 = 80 Find the product of the circled. So, the LCM of 16 and 0 is 80. Exercises 1 17 Find the LCM of the numbers using prime factorizations , , , 90 8 Chapter 1 Numerical Expressions and Factors
4 EXAMPLE Finding the LCM of Three Numbers Find the LCM of 4, 15, and 18. Write the prime factorization of each number. Circle each different factor where it appears the greatest number of times. 4 = appears most often here, so circle both s. 15 = 5 5 appears here only, so circle = appears most often here, so circle both s. 5 = 180 Find the product of the circled. So, the LCM of 4, 15, and 18 is 180. Exercises 7 Find the LCM of the numbers. 7., 5, , 10, 1 9. Write a set of numbers whose least common multiple is 100. EXAMPLE 4 Real-Life Application A traffic light changes every 0 seconds. Another traffic light changes every 40 seconds. Both lights just changed. After how many minutes will both lights change at the same time again? Find the LCM of 0 and 40 by listing multiples of each number. Circle the least common multiple. of 0: 0, 60, 90, 10,... of 40: 40, 80, 10, 160,... The LCM is 10. So, both lights will change again after 10 seconds. Because there are 60 seconds in 1 minute, there are = minutes in 10 seconds. Both lights will change at the same time again after minutes. 10. WHAT IF? In Example 4, the traffic light that changes every 40 seconds is adjusted to change every 45 seconds. Both lights just changed. After how many minutes will both lights change at the same time again? Section 1.6 Least Common Multiple 9
5 1.6 Exercises Help with Homework 1. VOCABULARY What is the least common multiple (LCM) of two numbers?. WRITING Describe how to find the LCM of two numbers by using prime factorization. 9+(-6)= +(-)= 4+(-9)= 9+(-1)= Use a Venn diagram to find the least common multiple of the numbers.., , , 15 1 Find the LCM of the numbers using lists of multiples. 6., 9 7., , , , , 18 Find the LCM of the numbers using prime factorizations. 1. 9, , , , 16. 6, , = 54 The LCM of 6 and 9 is ERROR ANALYSIS Describe and correct the error in finding the LCM. 19. AQUATICS You have diving lessons every fifth day and swimming lessons every third day. Today you have both lessons. In how many days will you have both lessons on the same day again? 0. HOT DOGS Hot dogs come in packs of 10, while buns come in packs of eight. What are the least numbers of packs you should buy in order to have the same numbers of hot dogs and buns? 1. MODELING Which model represents an LCM that is different from the other three? Explain your reasoning. A. B C. D Chapter 1 Numerical Expressions and Factors
6 Find the LCM of the numbers..,, 7., 5, , 9, , 8, , 18, , 10, 8 8. REASONING You need to find the LCM of 1 and 14. Would you rather list their multiples or use their prime factorizations? Explain. CRITICAL THINKING Tell whether the statement is always, sometimes, or never true. 9. The LCM of two different prime numbers is their product. 0. The LCM of a set of numbers is equal to one of the numbers in the set. 1. The GCF of two different numbers is the LCM of the numbers.. SUBWAY At Union Station, you notice that three subway lines just arrived at the same time. The table shows their arrival schedule. How long must you wait until all three lines arrive at Union Station at the same time again? Subway Line A B C Arrival Time every 10 min every 1 min every 15 min. RADIO CONTEST A radio station gives away $15 to every 15th caller, $5 to every 5th caller, and free concert tickets to every 100th caller. When will the station first give away all three prizes to one caller? 4. TREADMILL You and a friend are running on treadmills. You run 0.5 mile every minutes, and your friend runs miles every 14 minutes. You both start and stop running at the same time and run a whole number of miles. What is the least possible number of miles you and your friend can run? of 16 of 4 5. VENN DIAGRAM Refer to the Venn diagram. a. Copy and complete the Venn diagram. b. What is the LCM of 16, 4, and 40? of 40 c. What is the LCM of 16 and 40? 4 and 40? 6. When is the LCM of two numbers equal to their product? Write the product as a power. (Section 1.) MULTIPLE CHOICE Which two powers have the same value? (Section 1.) A 1 and 1 B 4 and 4 C and D 4 and 4 Section 1.6 Least Common Multiple 41
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