Question

Multiply the following: $256$ by $21$

Answer 1

Multiplying first number by ones and tens of second number.

Given product: $\begin{array}{c}256\\ \times 21\\ \_\_\_\_\_\_\_\_\end{array}$

Multiplying $256$ by $1$ ones.

$256\times 1=256$ ones

Now multiplying $256$ by $2$ tens.

$256\times 2=512$ tens $=5120$

Adding both the product:

$\begin{array}{c}256\\ \times 21\\ \_\_\_\_\_\_\_\_\_\\ \begin{array}{c}256\\ +5120\\ \_\_\_\_\_\_\_\_\_\\ 5376\end{array}\end{array}$

Therefore, $256\times 21=5376$