This activity supports the following first grade math standards: TEKS 1.3A: - counting multiples of 10 plus one digit numbers (up to 99) using pictorial and concrete models. CCSS 1.OA.A.1: Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. Printable R