Question

represent underroot5 on number line

Answer 1

√5  = √(4+1)
  Here 4 and 1 both are perfect square number  as √4 = 2 and √1 = 1 
So draw right triangle with side 2 and 1 
And according to Pythagoras theorem hypotenuse will √(22+12)  = √5
Then draw an arc of √5 on number line 

Answer 2

Hope it helps
Tnx...............