What is 36/81 in the simplest form?

36/81
= (36 ÷ 9)/(81 ÷ 9)
= 4/9

Divide top and bottom by 9 = 4/9

36/81 = 4/9

36 = 2*2*3*3 81 = 3*3*3*3

(2*2*3*3)/(3*3*3*3) cancelling two 3's numerator and denominator

2*2/3*3 = 4/9

The common factor between the numerator and denominator is 9 as stated before. So by dividing both by 9 you get the simplest form which is 4/9

4/9