Pre-Algebra Examples

$27 + 18$

Step 1

Add using long addition.

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Step 1.1

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


	$2$	$7$
$+$	$1$	$8$

Step 1.2

Add the numbers together from the far right column. Since the result is greater than

$10$ , carry the tens digit to the next column.

	$1$
	$2$	$7$
$+$	$1$	$8$
		$5$

Step 1.3

Add the numbers together from the next column to the left, including the carry digit.

	$1$
	$2$	$7$
$+$	$1$	$8$
	$4$	$5$

	$1$
	$2$	$7$
$+$	$1$	$8$
	$4$	$5$

Step 2

The sum of

$27$ and

$18$ is

$45$ .

$45$

$27 + 18$

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