透過借位（重新分組）減去數字超級簡單

Students will start the class taking notes on the part of addition to identify the addends and the sum or total. Students will do some simple addition examples without regrouping. Students will then be given an example in which they will have to regroup. They will be taught that when the sum of digits is greater than 9 they will have to carry the digit in the ten or hundreds. Students will be taught a strategy to help simplify this process and to have more of a visual representation. Students will do a few more guided examples in order to get them ready for the independent practice. Students will then apply the strategy learned to the problems presented in the independent practice. I will check for understanding as they practice more examples on their own.