486/900 = .54 = 54%. .......
(-5/6)+(-5/6) have the same denominator (number at bottom of fraction), so all you have to do is add the numerator(top number). So -5 +-5 =-10 . Now you have -10/6, which simplifies to -5/3.
Hope this helps :)
83, 74, 65, 56,47,38,29,20,11,2,etc
hope this helps