Basic Math Examples

$21 - 12$

Step 1

Subtract using long subtraction.

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Step 1.1

Set up the subtraction problem in long subtraction format.

Step 1.2

Borrow

$10$ from the digit in the next column to the left. Add the borrowed

$10$ to

$1$ . Reduce the number that was borrowed from by

$1$ .

Step 1.3

Subtract

$2$ from

$11$ .

Step 1.4

Subtract

$1$ from

$1$ .

Step 2

The result of

$21 - 12$ is

$9$ .

$9$