Students put all of their addition and subtraction skills together to solve equations.

We may see addition or subtraction as simple, but it requires different parts of our brain to store information and understand order.

12 - 5 = 7 Just like with addition, we can use a part-whole model to help partition larger numbers to make them easier to deal with in subtraction problems.

Under the common core, there are many ways to do subtraction—none of which involve borrowing and carrying.