Question

How many zeroes will ${16800}^2$ have at the end?

• A. 3
• B. 4
• C. 5
• D. 6

Answer 1

The correct option is B 4

$(168\times 100{)}^2$
$=168\times 168\times 100\times 100$
$=168\times 168\times 10000\Rightarrow$ 4 zeroes

Alternate:
If a number ends with 'n' zeroes, its square ends with '2n' zeroes.