Page 8 - E- Book Prim 6

Delta Modern Language Schools

Primary stage

Math department

1st term 2024/2025 Grade 6

Composite number:- is a whole number greater than 1 and has more

than two factors Ex:- 4 , 6 ,18

The prime factors of the number 20

20

54

20 = 2 x 2 x 5 22

Greatest common factor :
*Common factors of two numbers are factors that are the same

* The greatest common factor ( GCF ) of two numbers is the greatest
number that is a factor of both

EX: Find the common factors ad GCF of 12 , 15

Frist way ( listing method)

12 : 12 , 2 , 6 , 3 , 4 , 1
15: 15 , 3 , 5 , 1

Common factors: 1 , 3
G.C.F : 3

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