Unidad 2 de matematicas: Addition and Subtraction Story
In this unit, students learn to solve new types of addition and subtraction story problems and relate the quantities in the stories to equations.
Here, students encounter most of the problem types introduced in grade 1: Add to/Take From, Change Unknown, Put Together/Take Apart, Unknowns in All Positions, and Compare, Difference Unknown. The numbers are kept within 10 so students can focus on interpreting each problem and the relationship between counting and addition and subtraction. This also allows students to continue developing fluency with addition and subtraction within 10.