Pre-Algebra Examples

$12 + - 2$

Step 1

Replace all occurrences of $+$ $-$ with a single $-$ . A plus sign followed by a minus sign has the same mathematical meaning as a single minus sign because $1 \cdot - 1 = - 1$

$12 - 2$

Step 2

Subtract using long subtraction.

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Step 2.1

Set up the subtraction problem in long subtraction format.


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

Step 2.2

Subtract $2$ from $2$ .


	$1$	$2$
$-$		$2$
		$0$

Step 2.3

Subtract $0$ from $1$ .


	$1$	$2$
$-$		$2$
	$1$	$0$


	$1$	$2$
$-$		$2$
	$1$	$0$

Step 3

The result of $12 - 2$ is $10$ .

$10$