To find the lowest terms of the fraction 45/63, you can simplify it by dividing both the numerator and the denominator by their greatest common divisor (GCD). The GCD of 45 and 63 is 9.
So, divide both numbers by 9:
(45 ÷ 9) / (63 ÷ 9) = 5/7
The lowest terms of the fraction 45/63 are 5/7.