Fractions (Math Games)

Today for maths I have played Finding A Fraction game. This game helped me a lot with finding the right answer and the strategy. I learnt how to add fractions and how to use my strategy. Here is one of the questions and the strategy I used to solve it:
3/9 of 81 = __
81 divided by 9  officially gives me = 9 because 9 x 9 = 81... then 3 x 9 = which gives me 27... so 3/9 of 81 is equal to = 27...