Represent and solve problems involving addition and subtraction.
2.OA.1 Use strategies to add and subtract within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions.
2.G.3.ii Describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that identical wholes can be equally divided in different ways.
2.G.3.iii Demonstrate understanding that partitioning shapes into more equal shares creates smaller shares.