Since the denominator is 33 specifically, a trick I learned is that almost any number that is the numerator is repeated as a decimal if it is multiplied by three. If it is 6/33, the decimal is 0.181818181818....... and if it is 8/33, then it is 0.242424242424..... Using logic now, you can see that 7/33 is 0.212121212121.........
