Evaluate 15+-8

$15 + - 8$

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 $1 \cdot - 1 = - 1$

$15 - 8$

Subtract using long subtraction.

Set up the subtraction problem in long subtraction format.


	$1$	$5$
$-$		$8$

Borrow $10$ from the digit in the next column to the left. Add the borrowed $10$ to $5$ . Reduce the number that was borrowed from by $1$ .

	$0$	$15$
	$1$	$5$
$-$		$8$

Subtract $8$ from $15$ .

	$0$	$15$
	$1$	$5$
$-$		$8$
		$7$

Subtract $0$ from $0$ .

	$0$	$15$
	$1$	$5$
$-$		$8$
	$0$	$7$

	$0$	$15$
	$1$	$5$
$-$		$8$
	$0$	$7$

The result of $15 - 8$ is $7$ .

$7$

Evaluate 15+-8

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