Question

A student multiplied $8,035$ by $87$ instead of $78$. By how much was his answer greater than or less than the correct answer?

Answer 1

Finding the correct and wrong answers

wrong answer $=8035\times 87$
$=699045$
Correct answer $=8035\times 78$
$=626730$

Finding the difference between obtained answers

Wrong answer is greater than correct answer by

$=699045-626730$
$=72,315$

Thus, his answer was $72,315$ greater than correct answer.