Greatest common factor of two numbers x and y(x>y) is always less than or equal to y.
So, we will write down only those factors of 800 which are less than or equal to 45.
Factors of 45: 1, 3, 5, 9, 15 and 45.
Factors of 800: 1, 2, 4, 5, 8, 10, 16, 20, 25, 40...
So, Greatest common factor is 5.
Alternate Method:
Method of prime factorization:
45 = 3x3x5
800 = 2x2x2x2x2x5x5
It is clear that 5 is the only number which divides both 45 and 800.
So, gcf of 45 and 800 is 5.
The GCF of 45 and 800 is 5.
The GCF of 45 and 800 is 5.
1
The GCF is 5.
The GCF is 4.
The GCF is 80.
The GCF is 45.
The GCF of 45 and 180 is 45.
The GCF of 45 and 50 is 5.The GCF is 5.
Since 45 is a factor of 90, it is automatically the GCF.
The GCF is 45.
The GCF is 80.