To simplify the fraction 9/12, you need to find the greatest common divisor (GCD) of the numerator (9) and the denominator (12). The GCD of 9 and 12 is 3.
Next, divide both the numerator and the denominator by the GCD:
9 ÷ 3 = 3
12 ÷ 3 = 4
So, the simplified form of 9/12 is 3/4.