Learning+Progressions-Develop+understandings+of+addition+and+subtraction+and+strategies+for+basic+addition+facts+and+related+subtraction+facts


 * Solve and create story problems that match addition or subtraction expressions or equations using physical objects, pictures or words
 * Solve simple story problems (result unknown) involving joining, separating, and grouping situations. Solve story problems involving joining, separating, comparing, grouping, and partitioning using a variety of strategies, such as direct modeling with objects or pictures, counting on an counting back, and using related facts and known facts
 * Add and subtract two-digit numbers efficiently and accurately using a procedure that can be generalized, including the standards algorithm and describe why the procedure works