4.4 and 4.7 LCM and GCF - Ms. Sampson's Class...
19
4.4 and 4.7 LCM and GCF 5 th Grade Math
Transcript of 4.4 and 4.7 LCM and GCF - Ms. Sampson's Class...
4.4 and 4.7 LCM and GCF
5th Grade Math
8
Factors of 8 Factor Pairs
8
Factors of 8 Factor Pairs
1, 2, 4, 8
12
Factors of 12 Factor Pairs
12
Factors of 12
1, 2, 3, 4, 6, 12
Greatest Common Factor
There are two methods you can use to find the Greatest Common Factor. They are:
• Listing
• Prime Factorization
Greatest Common Factor: Listing
• Step one: List all factors of both numbers
• Step two: Find the one that is greatest!
Find the GCF of 12 and 8:
12:
8:
Greatest Common Factor: Listing
• Step one: List all factors of both numbers
• Step two: Find the one that is greatest!
Find the GCF of 12 and 8:
12: 1, 2, 3, 4, 6, 12
8: 1, 2, 4, 8
GCF = 4
Greatest Common Factor: Listing
Find the GCF of 16 and 24:
16:
24:
Greatest Common Factor: Listing
Find the GCF of 16 and 24:
16: 1, 2, 4, 8, 16
24: 1, 2, 3, 4, 6, 8, 12, 24
GCF= 8
Greatest Common Factor: Listing
Find the GCF of 32 and 40
32:
40:
Greatest Common Factor: Listing
Find the GCF of 32 and 40
32: 1, 2, 4, 8, 16, 32
40: 1, 2, 4, 5, 8, 10, 20, 40
GCF = 8
Least Common Multiple
• Find the LCM of 4 and 6
4:
6:
Least Common Multiple
• Find the LCM of 4 and 6
4: 4, 8, 12, 16, 20, 24
6: 6, 12
LCM = 12
Least Common Multiple
Find the LCM of 8 and 5
8:
5:
Least Common Multiple
Find the LCM of 8 and 5
8: 8, 16, 24, 32, 40, 48, 56
5: 5, 10, 15, 20, 25, 30, 35, 40
LCM = 40
Least Common Multiple
Find the LCM of 24 and 6
24:
6:
Least Common Multiple
Find the LCM of 24 and 6
24: 24, 48
6: 6, 12, 18, 24
Other Notes
Multiples are Many; Factors are Few
