Operations & Algebraic Thinking
Operations and Algebraic Thinking K.OA
Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.
Activities for Operations and Algebraic Thinking (click the activity for additional materials): More or Less, Ten Frame Flash ; Counting on Cup ; Bug Sort - Counting, sorting, and addition activity
1. Represent addition and subtraction with objects, fingers, mental images, drawings2, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations. Game for Acting Out Sums ; Making 10 game
2. Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem. PowerPoint for Subtraction, Elmer the Elephant Subtraction
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).
https://www.teachingchannel.org/videos/visualizing-number-combinations ; https://www.teachingchannel.org/videos/popsicle-stick-math
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. Card Game for Adding and Subtracting
1 Include groups with up to ten objects.
2 Drawings need not show details, but should show the mathematics in the problem.
(This applies wherever drawings are mentioned in the Standards.)
Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.
Activities for Operations and Algebraic Thinking (click the activity for additional materials): More or Less, Ten Frame Flash ; Counting on Cup ; Bug Sort - Counting, sorting, and addition activity
1. Represent addition and subtraction with objects, fingers, mental images, drawings2, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations. Game for Acting Out Sums ; Making 10 game
2. Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem. PowerPoint for Subtraction, Elmer the Elephant Subtraction
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).
https://www.teachingchannel.org/videos/visualizing-number-combinations ; https://www.teachingchannel.org/videos/popsicle-stick-math
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. Card Game for Adding and Subtracting
1 Include groups with up to ten objects.
2 Drawings need not show details, but should show the mathematics in the problem.
(This applies wherever drawings are mentioned in the Standards.)