Estimate √397 between two consecutive whole numbers

Answer 1

Identify two perfect squares between which the square root of 397 lies. The fastest way would be to consider the values of the following to ascertain approximate values:

10²=100

20²=400

Since 400 is extremely close to 397, it is likely the upper bound whole number, which means that 19² is the lower bound at 361. The two whole numbers between which the square root of 397 lies are 19 and 20.