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 ...

Hello, I'm Mr Firth, and I need your help today as we learn to add and subtract within ten. You can use lots of things to help you add and subtract. Counters, number lines and even your fingers. Let's ...

Erica Zippert has received funding from the Heising-Simons Foundation for her research. Bethany Rittle-Johnson receives funding from the U.S. Department of Education Institute of Education Sciences, ...