Here is a part-whole model. Sometimes the model is rotated. It looks different, but it still has two parts and a whole. We can use this model to help us solve problems. We can put 4 things in one of ...

Addition and subtraction with regrouping using different strategies to solve. In this lesson, students go over addition and subtraction with regrouping using different strategies to solve. Today we ...

To find any subtraction facts that children did not know (e.g., 14-8), 10 teachers successfully taught first- and second-grade children of all ability levels to count up from the smaller to the larger ...