Evaluate 16+-9

$16 + - 9$

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 $1 \cdot - 1 = - 1$

$16 - 9$

Step 2

Subtract using long subtraction.

Set up the subtraction problem in long subtraction format.


	$1$	$6$
$-$		$9$

Borrow $10$ from the digit in the next column to the left. Add the borrowed $10$ to $6$ . Reduce the number that was borrowed from by $1$ .

	$0$	$16$
	$1$	$6$
$-$		$9$

Subtract $9$ from $16$ .

	$0$	$16$
	$1$	$6$
$-$		$9$
		$7$

Subtract $0$ from $0$ .

	$0$	$16$
	$1$	$6$
$-$		$9$
	$0$	$7$

	$0$	$16$
	$1$	$6$
$-$		$9$
	$0$	$7$

Step 3

The result of $16 - 9$ is $7$ .

$7$

Evaluate 16+-9

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