Question

find the square root of smallest number which is divisible by 6 , 8 and 15

Answer 1

Now some people dislike the idea of 0 being considered a perfect square - see: Is 0 a perfect square?

So, what’s the next smallest square number? Why, it is 1 (= 1 squared). Is this divisible by 8, 15 and 20? Yes: 1/8 = 0.125, 1/15 = 0.6666…. and 1/20 = 0.05