Academic Standard: Domain
Operations and Algebraic Thinking
Tennessee State Standards
Students extend previous understanding of addition and subtraction to solve contextual problems within 20, add three addends, and recognize subtraction as an unknown addend problem. Students solve a variety of problem types, with unknowns in all positions, in order to make connections among contexts, equations, and strategies (See Table 1 - Addition and Subtraction Situations). Students should apply properties of operations as strategies to add and subtract when needed (See Table 3 - Properties of Operations). By the end of 1st grade, students should know from memory sums of 10 and fluently add and subtract within 20. Students demonstrate their understanding of the equal sign (=) by determining if addition/subtraction equations are true or false and writing equations to represent a given situation.