Page 9 - E- Book Prim 6
P. 9
Delta Modern Language Schools Grade 6
Primary stage
Math department 15
1st term 2024/2025
Second way ( prime factorization )
12
34 35
22
12 = 3 x 2 x 2
15 = 3 x 5
G.C.F = 3
Remark :
If there are no common prime factors , the G.C.F is 1
➢ G.C.F of 7 and 19 is 1
➢ G.C.F of 4 and 7 is 1
A multiple is the product of a given number and another whole
numbers
Common multiples are multiples of two or more numbers
EX : Find the common multiples and L.C.M of 4 and 6
Frist way ( listing method)
Multiples of 4 are : 0 , 4 ,8 , 12 ,16 , 20 , 24 , 28, ……..
Multiples of 6 are : 0 , 6 , 12 , 18 , 24 , 30 ,………….
common multiples of 4 and 6 ( other than 0) are: 12 , 24
L.C.M = 12
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