Help Find The Hcf Of 2*3*3*5; 2*2*3*3*3; 3*3*5*7 And Leave The Answers As Prime Factor?

Answer 1

pick the highest powers of each prime that appears in any of the numbers.
multiply them all together.
2^2 * 3^3 * 5 * 7
No smaller number is a multiple of each of the values.