In this item, we have 3.6 which is the sum of 3 and 0.6666 with 6 as a repeating number. Because 6 is repeating, instead of 10 as denominator, we use 9 such that the fraction is 6/9. The simplest form of 6/9 is 2/3. Therefore, the simplest form of the number in mixed form is 3 2/3 or equal to 11/3 as the simplest fraction.