5/9 as a Decimal 0.55555556 5/9 = 0.55555556 = 55.555556% Copy 5/9 = 0.55555556 = 55.555556%. Formula Used5 ÷ 9 = 0.55555556 Frequently Asked Questions What is 5/9 as a decimal?0.55555556.What is 5/9 as a percentage?55.555556%.