Evaluate and hence find the value of

What is the fraction which when multiplied by it self gives 0.00053361?

Simplify:

(i)

(ii)

Find the value of and hence find the value of

(i)

(ii)

Find the square root of each of the following correct to three places of decimal.

(i) 5 (ii) 7

(iii) 17 (iv) 20

(v) 66 (vi) 427

(vii) 1.7 (viii) 23.1

(ix) 2.5 (x) 237.615

(xi) 15.3215 (xii) 0.9

(xiii) 0.1 (xiv) 0.016

(xv) 0.00064 (xvi) 0.019

(xvii) (xviii)

(xix) (xx)