finding the greatest common factor
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Finding the Greatest Common Factor. Grade 5. Lesson Objectives. The student will be able to: Find the Greatest Common Factor ( GCF ) for The given Numbers. Think Backwards…. F ind Factors C ircle Common Factors G roup Greatest Factor. Step 1: Find the Factors. For 24 & 36 - PowerPoint PPT PresentationTRANSCRIPT
Finding the Greatest Finding the Greatest Common FactorCommon Factor
Finding the Greatest Finding the Greatest Common FactorCommon Factor
Grade 5Grade 5
Lesson Objectives
• The student will be able to:Find the Greatest Common Factor
(GCF) for The given Numbers
Think Backwards…
•Find Factors•Circle Common Factors•Group Greatest Factor
Step 1: Find the FactorsFor 24 & 36
•24 ( 1,2,3,4,6,8,12,24)•36 ( 1,2,3,4,6,9,12,18,36)
Step 2: Circle Common Factors
• 24 ( 1,2,3,4,6,8,12,24)• 36 ( 1, 2,3,4,6,9,12,18,36)
Step 3: Group the Greatest Factor
• 24 – 1,2,3,4,6,8,12,24• 36 – 1,2,3,4,6,9,12,18,36
The Greatest Common The Greatest Common Factor of 24 and 36 is…Factor of 24 and 36 is…The Greatest Common The Greatest Common Factor of 24 and 36 is…Factor of 24 and 36 is…
1212
Now let’s try finding the GCF
Find the GCF of 12 and 24• Step 1: Find the
factors|
• 12 – 1,2,3,4,6,12
• 24 – 1,2,3,4,6,8,12,24
Find the GCF of 12 and 24
• Step 2: Circle the common factors
• 12 – 1,2,3,4,6,12• 24 –
1,2,3,4,6,8,12,24
Find the GCF of 12 and 24
• Step 3: Group the greatest factor
• 12 – 1 ,2, 3, 4, 6, 12• 24 – 1 , 2, 3, 4, 6, 8 ,
12,24
The Greatest The Greatest CommonCommon
Factor of Factor of 1212 and and 2424 is …is …
The Greatest The Greatest CommonCommon
Factor of Factor of 1212 and and 2424 is …is …1212
Your turn!• Find the Greatest Common Factor
of 16 and 20.
• Remember…Find Factors, Circle Common, Group Greatest!
The Greatest The Greatest Common Factor of Common Factor of 1616
and and 2020 is… is…
The Greatest The Greatest Common Factor of Common Factor of 1616
and and 2020 is… is…
44
Are you ready?Are you ready?Are you ready?Are you ready?
Let's try some more!
Two Number
sFactors
Common
Factors
Greates
tCommon Factor
9 and 12
9 : 1,3,912: 1,2,3,4,6,12
1,3 3
Two Number
sFactors
Common
Factors
Greatest
Common Factor
6 and 18 6: 1,2,3,618: 1,2,3,6,9,18
1,2,3,6 6
•What is the greatest common factor of 45 and 105?
•15 25
35 45
What is the greatest common factor of 6 and 15?
2 3
6 15
Question 1Numbers (Year 5, Easy)
•What is the greatest common factor of 24 and 40?
4 6
8 12