Hello!
If you mean 24^135, then you would simply convert it into a decimal which gives you 2.1. WHen rounded, since the second number is less than 5 is would round to 2. However, if it doesn't need rounded 2.1 is fine. However, if you mean 24 times 135 then the correct answer would be 3,240.
I hope this helped!
I am, yours most sincerely,
SuperHelperThingy