This first-grade class is working on subtraction using the Part-part-whole strategy!
The part-part-whole strategy uses the idea that numbers can be split into parts. It provides a visual way for students to see the relationship between the whole number and its component parts.
The diagram below illustrates how this method works:
Diagram provided by Maguire, Tessa "part-part-whole poster" Tales from Outside the Classroom: https://www.talesfromoutsideth...