Question

Find the square root of 81 by successive subtraction method.

Answer 1

$\text{Here,}81–1=80$
$80–3=77$
$77–5=72$
$72–7=65$
$65–9=56$
$56–11=45$
$45–13=32$
$32–15=17$
$17–17=0$
Clearly, we have performed subtraction nine times
$\sqrt{81}=9$