It's pretty easy to see that both numbers are divisible by 5, so
let's start there. You can fit 5 into 30 a grand total of 6 times, and
45 divided by 5 is 9. So our new fraction is . But hold the phone!
(We were speaking figuratively - you can put the phone down now) Each of
those numbers is divisible by 3. Do our thing one more time and
we're left with , which can no longer be reduced. Not without a