The resource has been added to your collection
Casting Out Nines is a process that can be used for checking basic calculations. In subtraction, a "check digit" is created for the minuend, subtrahend and difference by adding the digits of each number together. The difference of the minuend and subtrahend's check digits equal the check digit of the difference. By comparing the check digit results, students can identify operational mistakes. An extension problem has students identify situations where this method provides
This resource was reviewed using the Curriki Review rubric and received an overall Curriki Review System rating of 3, as of 2014-01-25.
Not Rated Yet.