Basic Math Examples

21 \cdot 4

$21 \cdot 4$

Step 1

Multiply using long multiplication.

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Step 1.1

Multiply

$4$ by

$1$ . Place the result in the next column in the result line. There is one result line for each digit in

$4$ .


	$2$	$1$
$⨯$		$4$
		$4$

Step 1.2

Multiply

$4$ by

$2$ . Place the result in the next column in the result line. There is one result line for each digit in

$4$ .


	$2$	$1$
$⨯$		$4$
	$8$	$4$

Step 1.3

Add the numbers in each column. In this case, add

$4$ , then place the

$4$ in the result line.


	$2$	$1$
$⨯$		$4$
	$8$	$4$
		$4$

Step 1.4

Add the numbers in each column. In this case, add

$8$ , then place the

$8$ in the result line.


	$2$	$1$
$⨯$		$4$
	$8$	$4$
	$8$	$4$


	$2$	$1$
$⨯$		$4$
	$8$	$4$
	$8$	$4$

Step 2

The result of

$21 \cdot 4$ is

$84$ .

$84$

$21 \cdot 4$

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