Least common multiple
Presentation
•
Mathematics
•
5th Grade
•
Medium
Sheila Dale
Used 460+ times
FREE Resource
10 Slides • 3 Questions
1
Least Common Multiple
LCM
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Important vocabulary
multiples- products of a number when multiplied by 1, 2, 3, 4,
least- smallest, lowest
common- the same number that appears in both numbers.
Least common multiple (LCM)- the smallest multiple that 2 or more numbers have in common.
3
Steps to find the LCM
1. List multiples of each number Make sure you have correct multiples. (x1, x2 ,x3, etc.)
[Start with the larger number and find the first 5-6 multiples]. Then find the multiples of the smaller number.
2. When you get to the first number that is the same in both, you have found the LCM.
3. Write all work in neat orderly way.
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2 ways to find the LCM.
1. List all the multiples and find the smallest multiple.
2. Prime factorization - factor tree
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Poll
When finding LCM you must write all the factors of each number?
True
False
6
Find the LCM of each set of numbers.
LCM of 9 and 12
12 = 12, 24, 36, 48, 60...
LCM = 36
7
1.) Find LCM of 2 and 3
3 = 3, 6, 9, 12, 15....
2 = 2, 4, 6
LCM= 6
2.) Find the LCM of 12 and 24
8
Fill in the Blanks
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9
Prime factorization- breaking down a composite number into its prime factors. (factor tree)
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Find the prime factorization of 24. There is more than one way to start prime factorization. The next slide shows how you can find the prime factorization of 24.
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12
Find the prime factorization of 60.
Find the prime factorization of 42.
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Fill in the Blanks
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Least Common Multiple
LCM
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