This file contains 15 printables that correlate with Common Core 2.OA.A.1. These pages can be used as guided practice, independent practice or homework. They are also great as a review!
2.OA.A.1 - Use addition and subtraction 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, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.
27 + 15 = ☐, 16 + ☐ = 28, ☐+ 13 = 37