Pre-Algebra Examples

$10 + - 5$

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 $1 \cdot - 1 = - 1$

$10 - 5$

Step 2

Subtract using long subtraction.

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Step 2.1

Set up the subtraction problem in long subtraction format.


	$1$	$0$
$-$		$5$

Step 2.2

Borrow $10$ from the digit in the next column to the left. Add the borrowed $10$ to $0$ . Reduce the number that was borrowed from by $1$ .

	$0$	$10$
	$1$	$0$
$-$		$5$

Step 2.3

Subtract $5$ from $10$ .

	$0$	$10$
	$1$	$0$
$-$		$5$
		$5$

Step 2.4

Subtract $0$ from $0$ .

	$0$	$10$
	$1$	$0$
$-$		$5$
	$0$	$5$

	$0$	$10$
	$1$	$0$
$-$		$5$
	$0$	$5$

Step 3

The result of $10 - 5$ is $5$ .

$5$