Page 10 - E book 5
P. 10
Delta Modern Language Schools
Primary stage Grade 5
Math department
1st term 2024/2025
prime and composite numbers :
Prime number is : a whole number greater than 1 and has
exactly two different factors 1 and itself Ex: - 2 , 3 , 5
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
22
20 = 2 x 2 x 5
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
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