Download presentation

1
**Least Common Multiple LCM 2 Methods**

2
Product The answer to a multiplication problem. 6 X 6 = 36

3
What is the product? 7 X 8 = 56

4
**Name the first six multiples of 6**

The product of a whole number multiplied times any other whole number. Name the first six multiples of 6 6, 12, 18, 24, 30, 36

5
**Name the first six multiples of 5**

5, 10, 15, 20, 25, 30

6
Common Multiple A Common Multiple is a number that is a multiple of two numbers. Here are common multiples for the numbers 4 and 10 4 = 4, 8, 12, 16, 20, 24 10 = 10, 20, 30, 40, 50,

7
Least Common Multiple LCM - Smallest number that a set of given numbers divides evenly into. Least Common Multiple - It is useful to know how to do this so you can find a common denominator when adding or subtracting fractions. THERE ARE TWO WAYS TO FIND LCM

8
**Least Common Multiple Method # 1**

TO FIND THE LCM OF TWO NUMBERS List the multiples of both numbers Find the least multiple that both numbers have in common.

9
**Least Common Multiple Method # 1**

Make a List of Multiples Find the LCM of 10 and 12. 10: 10 , 20 , 30 , 40 , 50 , 60 , 70 , 80 , 90 , 100 ... 12: 12 , 24 , 36 , 48 , 60 LCM = 60

10
**Least Common Multiple Method # 1**

Make a List of Multiples Find the LCM of 32 and 40. 32: 32 , 64 , 96 , 128 , 160 , 192 , 224 , 256 ... 40: 40 , 80 , 120 , 160 LCM = 160

11
**What is the Least Common Multiple of 4 & 10**

4 = 4, 8, 12, 16, 20, 24 10 = 10, 20, 30, 40, 50,

12
**What is the Least Common Multiple of 6 & 8**

6 = 6, 12, 18, 24, 30, 36 8 = 8, 16, 24, 32, 40, 48

13
**What is the Least Common Multiple of 3 & 9**

3 = 3, 6, 9, 12, 15, 21, 9 = 9, 18, 27, 36, 45, 54

14
Method #1 is easy to do! Method #1 is a good method if both of your numbers are really small. What if you have really large numbers? It might take too long to keep listing multiples until you find a common multiple. SO HERE IS METHOD # 2

15
**Least Common Multiple Method # 2**

1) Write the prime factorization of each number. Select all common factors ONCE. 3) Then select the remaining factors and multiply.

16
**Least Common Multiple Method # 2**

18 20 2 9 2 10 3 3 2 5 Select all common factors once. Then select the remaining factors.

17
**Least Common Multiple Method # 2**

45 72 5 9 8 9 3 3 2 4 3 3 2 2 Select all common factors once. Then select the remaining factors.

18
**Least Common Multiple Method # 2**

Find the LCM of 48 and 80. 2 Common Factors Once 2 2 2 Remaining Factors

19
**SO I GUESS YOU ARE WONDERING**

Least Common Multiple Method # 2 SO I GUESS YOU ARE WONDERING When Are We Ever Gonna Have To Use This?

20
**Least Common Multiple Method # 2**

What is the LCM used for? The LCM is used to find common denominators so that fractions may be easily compared, added, or subtracted.

21
**Least Common Multiple Method # 2**

The GCF and LCM are used so regularly that most people find them mentally. GCF = 1 GCF = 5 1) 2) LCM = 72 LCM = 60 copyright©amberpasillas2010

22
**Least Common Multiple Method # 2**

The GCF and LCM are used so regularly that most people find them mentally. GCF = 4 GCF = 4 1) 2) LCM = 60 LCM = 24 copyright©amberpasillas2010

23
**Least Common Multiple Method # 2**

THE END Take Out Your Study Guide!!!

24
**#9 Multiples A number that is added to itself becomes a multiple.**

3, 6, 9, 12, 15, Multiples of 3 = Multiples can go on infinitely forever. The least common multiple (LCM) is the least common number that is a multiple of 2 numbers. It is useful to know this for adding fractions.

25
**LCM is 12 LCM Make a List Method # 1 4 = 4, 8, 12, 16, 20…**

#10 TO FIND THE LCM OF 4 and 12: 1) List the multiples of both numbers 4 = 4, 8, 12, 16, 20… 12 = 12, 24, 36… 2) Find the least multiple that both numbers have in common. LCM is 12 This method is useful if both numbers are small.

26
**18 20 2 9 2 10 3 3 2 5 #11 LCM Prime Factorization Method # 2**

1) List the prime factorization to find the LCM. 18 20 2 9 2 10 3 3 2 5 2) Select all common factors once. 3) Select all remaining factors, and multiply.

Similar presentations

Presentation is loading. Please wait....

OK

0 x0 0. 0 x2 0 0 x1 0 0 x3 0 1 x7 7 2 x0 0 9 x0 0.

0 x0 0. 0 x2 0 0 x1 0 0 x3 0 1 x7 7 2 x0 0 9 x0 0.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google