Question

Jack wants to prepare for a competition and he decides to start running everyday in the morning to burn some calories. If Jack burns $487$ calories per day by running, then how many calories would Jack burn in $178$ days by running?

• A. $86,868$ calories
• B. $86,686$ calories
• C. $68,686$ calories

Answer 1

The correct option is B $86,686$ calories

Calories burnt by Jack in $1$ day $=487$ calories
Calories burnt by Jack in $178$ days $=178\times 487$ calories

$178\times 487$ can be evaluated as:

First, we need to multiply the units digit of $178$, i.e., $8$ with $487$.

Now, we would multiply the tens digit of $178$, i.e., $7$ with $487$.


Now, we would multiply the hundreds digit of $178$, i.e., $1$ with $487$.

Finally, we would add $3896$, $34090$ and $48700$ to get the answer.






Calories burnt by Jack in $178$ days would be $86,686$ calories.