Greatest Common Factors (Theme: The Nature of Life)
Year 4 Home Learning
Nama:___________________
Date:__________________
Find the Greatest Common Factors of these pairs using 4 methods that you have learnt
Venn Diagram
Descriptive
Factors of 24 = 1, 2, 3, 4, 6, 8, 12, 24
18
Factors of 18 = 1, 2, 3, 6, 9, 18
3
The common factors are 1, 2, 3, 6
2
24
2
3
2
The Greatest Common factor is 6
NUMBERS
18
8
18
9
3
24
12
4
4
6
2
3
2
6
2
2
3
Prime Factorization of 18 and 24 are the circled numbers.
They are
GCF is the multiplication of
numbers in the circle. So, 2 x 3 = 6
GCF = 6
Ladder Method
24
GCF = 6
3
Divider
2
3
GCF is the multiplication of
numbers in the middle part.
So, 2 x 3 = 6
18
=3x2x3
24
=2x2x2x3
Then find the common numbers of the prime factorization.
They are 2 and 3. So, the GCF is 2 x 3 = 6
Prime Factorization
Designed by year 4 teaching team
Now, try to do this yourself
Venn Diagram
Descriptive
Factors of 12 = …………………………………………………..
Factors of 20 = …………………………………………………..
12
20
The common factors are ………………………………………
The Greatest Common factor is …………………………….
Make tree factors of 12 and 20
Divider
12
Ladder Method
20
Prime Factorization
Designed by year 4 teaching team
Find the LCM of this pair of number
Venn Diagram
Descriptive
List down multiple of
12
= …………………………………………………………
20
= ………………………………………………………….
Common Multiple
= …………………………
LCM
= …………………………
Make tree factors of 12 and 20
Divider
Ladder Method
12
20
Prime Factorization
Designed by year 4 teaching team
Using one of the ways of finding GCF and LCM mentioned above, find the GCF and the
LCM of this pair of number
18 and 20
Designed by year 4 teaching team