Answer:
Greatest (highest) common factor (divisor) 
gcf, hcf, gcd (675; 150) = 75 = 3 × 52; 
The numbers have common prime factors.
Explanation:
675 = 33 × 52; 
150 = 2 × 3 × 52; 
Multiply all the common prime factors, by the lowest exponents. 
Greatest (highest) common factor (divisor): 
gcf, hcf, gcd (675; 150) = 3 × 52
Step 1. Divide the larger number by the smaller one: 
675 ÷ 150 = 4 + 75; 
Step 2. Divide the smaller number by the above operation's remainder: 
150 ÷ 75 = 2 + 0; 
At this step, the remainder is zero, so we stop: 
75 is the number we were looking for, the last remainder that is not zero. 
This is the greatest common factor (divisor). 
Greatest (highest) common factor (divisor): 
gcf, hcf, gcd (675; 150) = 75
gcf, hcf, gcd (675; 150) = 75 = 3 × 52