California Common Core Math Standard 2.Oa.1. Web count to tell the number of objects. Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and.

Fill in the mssing numbers to make the subtraction sentences true. Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or. Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and.