Their are challenges of teaching math to a multi-leveled group of students. Some students have that ability to process numbers with ease while others struggle. Double digit subtracting can be difficult for those that seem to get lost in the “steps” to solve that problem. I came up with a way that seems to work well by using the acronym for Channel 2- CBS.
The letters refer to our 3 step method to solve all double digit problems- Check, Borrow, and Subtract. We always check our problem before we attempt to solve it. Can I subtract? If yes, then do it! If not, then I need to go to my step 2 which is to borrow. After I have changed my 2 numbers, then I move to my final step- subtract.