Algebra Examples

$10 - - 2$

Step 1

Replace all occurrences of $-$ $-$ with a single $+$ . Two consecutive minus signs have the same mathematical meaning as a single plus sign because $- 1 \cdot - 1 = 1$

$10 + 2$

Step 2

Add using long addition.

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Step 2.1

Set up the addition in long addition format, placing the larger number on top of the smaller number.


	$1$	$0$
$+$		$2$

Step 2.2

Add the numbers together from the far right column.


	$1$	$0$
$+$		$2$
		$2$

Step 2.3

Add the numbers together from the next column to the left.


	$1$	$0$
$+$		$2$
	$1$	$2$


	$1$	$0$
$+$		$2$
	$1$	$2$

Step 3

The sum of $10$ and $2$ is $12$ .

$12$