What is the square roots of 144/256? -9/16 and 9/16 -12/16 and 12/16 -12/18 and 12/18 -72/128 and 72/128

To find the square root of something, you have to find the number that can multiply by itself to get the desired number.

So: 12 x 12= 144

So this means that the square root of 144 is 12.

Next: 16 x 16= 256

So 16 is the square root of 256.

The square root of any number (not negative) can easily be found by inserting that number into a calculator, then hitting the square root button.

Whose mistake? can you give more details to what the question is asking?