Operations and Algebraic Thinking

Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.
K.OA.1 Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.
K.OA.2 Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem.

Overview of Problem Types: Glossary, Table 1
Tasks
Add to-Result Unknown
K.OA Task 1a; K.OA 1a Student Form
K.OA Task 1b; K.OA 1b Student Form
K.OA Task 1c; K.OA 1c Student Form
K.OA Task 1d; K.OA 1d Student Form
K.OA Task 1e; K.OA 1e Student Form

Take From-Result Unknown
K.OA Task 2a; K.OA 2a Student Form
K.OA Task 2b; K.OA 2b Student Form
K.OA Task 2c; K.OA 2c Student Form
K.OA Task 2d; K.OA 2d Student Form

Put Together/Take Apart-Total Unknown
K.OA.Task 3a; K.OA 3a Student Form
K.OA Task 3b; K.OA 3b Student Form
K.OA Task 3c; K.OA 3c Student Form
K.OA Task 3d; K.OA 3d Student Form

Put Together/Take Apart-Both Addends Unknown
K.OA Task 4a; K.OA 4a Student Form
K.OA Task 4b; K.OA 4b Student Form
K.OA Task 4c; K.OA 4c Student Form
K.OA Task 4d; K.OA 4d Student Form

K.OA.3 Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).
Tasks
K.OA Task 5a; K.OA 5a Student Form
K.OA Task 5b; K.OA 5b Student Form
K.OA Task 5c; K.OA 5c Student Form
K.OA Task 5d; K.OA 5d Student Form
K.OA Task 5e; K.OA 5e Student Form
K.OA Task 5f; K.OA 5f Student Form
K.OA Task 5g; K.OA 5g Student Form
K.OA Task 5h; K.OA 5h Student Form
K.OA Task 5hh; K.OA 5hh Student Form

K.OA.4 For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation.
Tasks
K.OA Task 6a
K.OA Task 6b
K.OA Task 6c; K.OA 6c BLM
K.OA Task 6d
K.OA Task 6e

K.OA.5 Fluently add and subtract within 5.
Tasks
K.OA Task 7a (addition)
K.OA Task 7b (addtion)
K.OA Task 8a (subtraction)
K.OA Task 8b (subtraction)
K.OA Task 8c (subtraction)