Question

write two consecutive perfect square closest to 20. estimate the value of square 20 . square your estimate. use this value to revise your estimate. keep revising your estimating until the square of the estimate is within 1 decimal place of 20.

my eng is limited, can anyone help me the last sentence mean? " keep revising your estimating until the square of the estimate is within 1 decimal place of 20. ""

Thank you!

Answer 1

4^2 = 16
5^2 = 25

so, 4.5 is a good first guess.

4.5^2 = 20.25
too big
4.4^2 = 19.36

4.45^2 = 19.80
4.46^2 = 19.89
4.47^2 = 19.98
4.48^2 = 20.07

So, you want something between 4.47 and 4.48

keep going.