Question

how to find out the value without calculateing the squares ?​

27 square - 26 square

Answer 1

Take the number you wish to find the square root of, and group the digits in pairs starting from the right end. For example, if you want to calculate the square root of 8254129, write it as 8 25 41 29. Then, put a bar over it as when doing long division.

so , as per your question

27×27 = 729

26×26=676

729-676

=53