Basic Math Examples

21 - 12

$21 - 12$

Step 1

Subtract using long subtraction.

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Step 1.1

Set up the subtraction problem in long subtraction format.


	$2$ $2$	$1$ $1$
$-$ $-$	$1$ $1$	$2$ $2$

Step 1.2

Borrow

10

$10$ from the digit in the next column to the left. Add the borrowed

10

$10$ to

1

$1$ . Reduce the number that was borrowed from by

1

$1$ .

	$1$ $1$	$11$ $11$
	$2$ $2$	$1$ $1$
$-$ $-$	$1$ $1$	$2$ $2$

Step 1.3

Subtract

2

$2$ from

11

$11$ .

	$1$ $1$	$11$ $11$
	$2$ $2$	$1$ $1$
$-$ $-$	$1$ $1$	$2$ $2$
		$9$ $9$

Step 1.4

Subtract

1

$1$ from

1

$1$ .

	$1$ $1$	$11$ $11$
	$2$ $2$	$1$ $1$
$-$ $-$	$1$ $1$	$2$ $2$
	$0$ $0$	$9$ $9$

	$1$ $1$	$11$ $11$
	$2$ $2$	$1$ $1$
$-$ $-$	$1$ $1$	$2$ $2$
	$0$ $0$	$9$ $9$

Step 2

The result of

21 - 12

$21 - 12$ is

9

$9$ .

9

$9$

21 - 12

$21 - 12$

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