# K.OA - Operations & Algebraic Thinking

## From EngageNY

Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.
1. Represent addition and subtraction with objects, fingers, mental images, drawings*, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.
2. Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem.
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).
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.
5. Fluently add and subtract within 5.
* Drawings need not show details, but should show the mathematics in the problem. (This applies wherever drawings are mentioned in the Standards.)

## Supporting Materials

#### Tiny Polka Dot

Tiny Polka Dot cards come in six suits, each with eleven cards representing the numbers from 0 to 10. Each suit uses a different representation. These are Ten Frames, Big and Little Dots, Circles, Doubles Plus One, Numerals, and Dice Patterns. Tiny Polka Dot comes with 12 different games,...