Question

a student multiplied 7236 by 65 instead of multiplying by 56 by how much was his

Answer 1

$\large{\bold{Solution:}}$

The required multiplication = $7236 \times 56$

The multiplication done by the student
$= 7236 \times 65$

Difference $=[7236 \times 65] - [7236 \times 56]$

$= 7236 \: [65 - 56]$

$= 7236 \times 9 =$$\fbox{\textbf{65124}}$✔️