Question

How many seconds are there in $365$ days if there are $86,400$ seconds in a day?

• A. $31,536,000$ seconds
• B. $31,356,000$ seconds
• C. $31,635,000$ seconds

Answer 1

The correct option is A $31,536,000$ seconds

The number of seconds in a day $=86,400$
The number of seconds in 365 days $=365\times 86,400$ seconds

The product $=365\times 86,400$ can be evaluated as:

First, multiply the units digit 5 (in 365) with $86,400$.

Now, multiply the tens digit 6 (in 365) with $86,400$.

Now, multiply the hundreds digit 3 (in 365) with $86,400$.

Finally, we add $432000$, $5184000$ and $25920000$ to get the product.


$365\times 86,400$ seconds $=31,536,000$ seconds

Thus, the number of seconds in 365 days is 31,536,000 seconds.