45 and 567 are both odd, so they are not divisible by 2.
Are they divisible by 3?
Add the digits of 45. 4 + 5 = 9. Since 9 is divisible by 3, 45 is divisible by 3.
Add the digits of 567. 5+6+7 = 18. Since 18 is divisible by 3, 567 is divisible by 3.
Now we divide the numerator and denominator by 3.
45/3 = 15
567/3 = 189
We have this now:
45/567 = 15/189
We need to try to reduce it more.
15 is divisible by 3 and 5.
189 is divisible by 3.
15/3 = 5
189/3 = 63
45/567 = 15/189 = 5/63
5 is prime and divisible only by 1 and 5.
63 is not divisible by 5.
The fraction cannot be reduced any more.
Answer: 5/63