Addition & subtraction with regrouping using different strategies to solve.

Ellis showed a subtraction problem, performed both using the traditional regrouping, or borrow-and-carry, algorithm and using an example from the common core. Here’s a screenshot of the two methods.

An alternative is virtual manipulatives, including app-based manipulatives. This study compared the use of app-based manipulatives to concrete manipulatives in supporting students with disabilities in ...