# Domain K.OA, Operations and Algebraic Thinking

## Cluster K.OA.A, Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.

Major Cluster

### Standard K.OA.A.1

Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.

32 Lessons

57 Activities

### Standard K.OA.A.2

Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem.

30 Lessons

33 Activities

### Standard K.OA.A.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).

26 Lessons

93 Activities

### Standard K.OA.A.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.

3 Lessons

19 Activities

### Standard K.OA.A.5

Fluently add and subtract within 5.

9 Lessons

32 Activities