An article teaching adding and subtracting numbers with 1 or 2 digits.

When you are adding larger numbers, it’s often better to use a written method. Column addition is a good written method to add one number to another. It involves putting the digits of each ...

The one downside to the above is that the number of digits in the line numbers changes and this makes the spacing a little off after line 9. This can be easily remedied with a minor addition to ...