To simplify the fraction 28/63, we first need to find the greatest common divisor (GCD) of the numerator (28) and the denominator (63).
The factors of 28 are: 1, 2, 4, 7, 14, 28
The factors of 63 are: 1, 3, 7, 9, 21, 63
The greatest common factor is 7.
Now, we divide both the numerator and the denominator by their GCD:
Numerator: 28 ÷ 7 = 4
Denominator: 63 ÷ 7 = 9
So, the simplified form of the fraction 28/63 is 4/9.