Question

what is the H.C.F of 9,12 and 18

Answer 1

The instructions to find the GCF of 4, 9, 12 and 18 are the next:

1. Decompose all numbers into prime factors42221 93331 12262331 182933312. Write all numbers as the product of its prime factorsPrime factors of 4=22Prime factors of 9=32Prime factors of 12=22 . 3Prime factors of 18=2 . 323. Choose the common prime factors with the lowest exponent

Common prime factors: None

Common prime factors with the lowest exponent: None

4. Calculate the Greatest Common Factor or GCF

Remember, to find the GCF of several numbers you must multiply the common prime factors with the lowest exponent.

Since there are not common prime factors the GCF is 1

Answer 2

9 = 1×3×3
12=1×2×2×3
18=1×3×2×3
.°. HCF = 1×3=3