You wake up on a rainy Sunday morning, buzzing with energy. Your 14-year-old son is out playing football in the mud with his friends, so you jump in. From the window, your wife smiles and says, ...

We can also show this as a part-whole model and a bar model. Each way of showing the calculation shows part + part = whole. 75 is the whole number and 43 and 32 are the parts. When a number is ...