Page 35 - prim 4 كامل

Delta Modern Language Schools
Maths Department
Prim 4 2023-2024

Unit (6): factors and multiple

Lesson 2 : Greatest common factor

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

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

15: 15 , 3 , 5 , 1
Common factors: 1 , 3
G.C.F : 3

Question:

1) Choose the correct answer ::

1) The GCF of 12 and 16 is ……………….

a) 6 b) 8 c) 4 d) 12

2) the common factor of all numbers is

a) 1 b) 2 c) 3 d) 4
d) 18 and 20
3) 1 and 9 are the common factors of ….

b) 2 and 9 b) 2 and 18 c) 9 and 18

2) Complete :

1) The GCF of 4 and 8 is ………….
2) The factors of 9 are ……………
3) The GCF of 10 and 15 is …………

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