gcf – greatest common factor 4-3 6.ns.4 i can find the greatest common factors of two whole...
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GCF – Greatest Common Factor4-3
6.NS.4 I can find the greatest common factors of two whole numbers less than or equal to
100
LCM – Least Common Multiple
6.NS.4I can fin the least common multiple of two numbers less than or equal to 12
Greatest Common Factor
• What are we trying to find?• What are factors?• Can you write your own defintion?
Least Common Multiple
• What are we trying to find?• What are multiples?• Can you write your own defintion?
The Greatest Common Factor (GCF) of 2 numbers is the largest factor the 2 numbers have in common.
Factors of 24:
Factors of 36:
Common factors:
1, 2, 3, 4, 6, 8,
1, 2, 3, 4, 6,
The greatest common factor (GCF) of 24 and 36 is 12.
1, 2, 3, 4, 6, 9,
12,
12, 18,
24
36
12
• The Least Common Multiple (LCM) is the smallest number that is a multiple of two numbers.
• List the multiples and circle the smallest on they have in common
4: 4, 8, 12 , 16, 20, 24, 28, 32, 36, 40, 44, …
5: 5, 10, 15, 20, 25, 30, 35, 40, 45, . . .
Find the GCF and LCM
• 9 , 12• GCF:
• LCM:
Keep them Straight……
• Focus on the key words: Multiple and Factors.– Least Common Multiple– Greatest Common Factor
• Multiple:
• Factors:
Find the Greatest Common Factor
• 3, 4
• 12, 18
• 9, 21
Find the Least Common Multiple
• 2, 10
• 5, 6
• 3, 12
.
How well can you find the LCM and GCF of two numbers?
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