411 REFERENCE · Wikibooks
Programmed Math/Addition
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Prerequisites: Counting
Addition of whole numbers can be done pretty much by just counting.
For example: 4 + 1 = 5, the same as counting to the next number, but 4 + 2 = 6, you count twice. Technically, you are expanding 4 + 2 = 6 to 4 + 1 + 1 = 6.
, then, ,