Question

By splitting into prime factors, find the square root of $729$.

• A. $27$
• B. $21$
• C. $17$
• D. $87$

Answer 1

The correct option is A $27$

Prime factorisation of $729=3\times 3\times 3\times 3\times 3\times 3$

$\sqrt{729}=\sqrt{3\times 3\times 3\times 3\times 3\times 3}=3\times 3\times 3=27$