Evaluate 10--3

$10 - - 3$

Step 1

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

$10 + 3$

Step 2

Add using long addition.

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


	$1$	$0$
$+$		$3$

Add the numbers together from the far right column.


	$1$	$0$
$+$		$3$
		$3$

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


	$1$	$0$
$+$		$3$
	$1$	$3$


	$1$	$0$
$+$		$3$
	$1$	$3$

Step 3

The sum of $10$ and $3$ is $13$ .

$13$

Evaluate 10--3

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