Question

Multiply $3$ by $14$ using box method.

• A. $40$
• B. $41$
• C. $42$
• D. $43$

Answer 1

The correct option is C $42$

$3\times 14$ can be expressed as: $3\times (10+4)$

Now, placing the expanded form of numbers on box as shown in below figure,


Multiplying numbers on top of the box with the number on left side one by one as shown in below figure,


We know,
$3\times 10=30$
$3\times 4=12$


Now, adding the numbers inside the box will give the product.
$\therefore 3\times 14=30+12=42$

Therefore, (c) is the correct option.