The distributive property of 75/3 may look like:
75/3 = 30/3 + 30/3 + 15/3
It's easier to count 30/3 than 75/3, so I did it twice and then I had 15 left, because 75 - (30 + 30) = 15.
That's basicly how you do it - just try to find the easiest number to divide (smaller then the given dividend).