Expressing each number as the product of prime numbers can help in taking out common factor.
Prime factorization of 90 = 2x3x3x5 = 21x32x51
Prime factorization of 216 = 2x2x2x3x3x3 = 23x33
It is clear that 2x3x3 or 21x32 is common in P.F. of both numbers.
So, the highest common factor is 2x3x3 = 18.
The greatest common factor of 90 and 216 is 18 90 = 2 * 32 * 5 216 = 23 * 33 greatest common factor = 2 * 32 = 2 * 9 = 18 90 / 18 = 5 216 / 18 = 12 because the greatest common factor of these is 1.
obviously, its highest common factor is the number itself. so the answer here is 90.
It is: 18
90
6
30
10
9
The Greatest Common Factor (GCF) is: 9
95 and 90's highest common factor is five.
That would be 15. Only a number ending in five would be a factor of 75. 45 is not. 35 is not. 25 is not. 15 is, and it also is a factor of 90. This makes it the highest common factor of 75 and 90, although it is not a prime factor.
hcf(6, 90) = 6.