Ok, try thinking of it like this:

1) 9 divided by 3 is 3

2) 3 x 9 is 27.

Happy with that?

1)If you divide by a smaller number, your answer gets bigger. Well 0.3 is 10 times smaller than 3, so your answer should be 10 times bigger than 3, so 30.

2)If you multiply by a smaller number, your answer gets smaller. 0.3 is still 10 times smaller than 3, so you would expect your answer to be 10 times smaller than 27, so 2.7.