You can rearrange a decimal (fraction) into a proper fraction:

Your considerations are OK!I know that when you multiply two terms, you add their exponents. So could you restate the question as: 10 x L^{0.2}x2.25^{0.3}x L^{0.3 }? I wouldn't know how to go from there though..

In a product the order of the factors can be changed without changing the final result: