1.OA.A. Represent and solve problems involving addition and subtraction.

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.See Glossary, Table 1.

• 20 Tickets
• At the Park
• Boys and Girls, Variation 1
• Boys and Girls, Variation 2
• Field Day Scarcity
• Finding a Chair
• Growing Bean Plants
• Link-Cube Addition
• Maria’s Marbles
• Measuring Blocks
• Measuring Blocks
• Peyton's Books
• School Supplies
• Sharing Markers
• The Pet Snake

1.OA.A.2. Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

• Daisies in vases
• The Very Hungry Caterpillar