## Common Core State Standards for Mathematics

Grade(s) K resources related to the following standard:
Operations and Algebraic Thinking
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.

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This free iOS app provides activities for young children to develop skills in writing numerals, counting, addition, ordering, patterns, parity, algebraic thinking, and problem solving.
Activity, Interactive Media, Mobile App
This interactive activity helps a user understand that one concept of subtraction is finding a missing addend. In each scenario, there is a given number of animals and some of them leave or hide, and the student must select the number from four choices that are missing based on knowing how many animals are still there. If a correct response is given, then the family of facts are provided and if an incorrect response is made, there is positive instructional feedback provided.
Activity, Interactive Media
This professional development video clip of students engaged in Common Core Practice Standard #5- Use appropriate tools strategically, shows a classroom of kindergarten students exploring properties of addition utilizing dominoes. Through this clip, Mrs. Wright demonstrates how to use dominoes to show addition sentences and begins to lay the framework for the zero property and commutative property. Additional resources include a video transcript and teaching tips.
Instructional Strategy, Video
These activites are designed to be done in part or whole each day throughout baseball season in your classroom. Each activity includes students keeping track of the wins and losses of your local baseball team. As a class they will be looking for patterns, ways to read data easier: ten frames or tallies, and addition or subtraction sentences that can be made of the data. The resource includes 3 worksheets for data collection, assessment options, and discussion questions.
Activity, Lesson Plans
Students can use this interactive Flash applet to practice subitizing and counting groups of objects, to develop awareness of our base-10 number system, and to learn basic addition facts. In the four included games students construct groups of 10 objects, add groups of objects within 20, and identify and record numbers within 20. Auditory prompts support students with limited reading ability.
Activity, Interactive Media
This game helps children develop concepts and fluency in addition and subtraction within 15. Students indicate the correct answer to a displayed problem by clicking on the appropriately numbered person in a number line. Audio and visual cues help reinforce counting on and back, as well as the meaning and effects of the operations. The resource includes links to printable worksheets and useful information and activities for teachers and parents.
Activity, Instructional Strategy, Interactive Media
This flexible, interactive Flash applet allows students to explore number patterns and to develop number sense and fluency with addition, subtraction, and multiplication. The student or teacher enters a starting number and a step increment. Both values may be up to 4 digits and either positive or negative. The user then mentally carries out the sequence and enters the resulting 10th and 11th terms. The first 9 terms are color-coded in groups of 3 and may be shown or hidden one group at a time. Users have the option of hiding or showing the starting number and/or the increment.
Activity, Interactive Media
Grade Level: K, 1, 2, 3, 4, 5, 6+
This interactive and animated Flash book, the first by collaborators Greg Tang and Harry Briggs, presents 16 riddles that use clever, visual tricks to challenge children to add and eventually multiply numbers in efficient groups. The best solutions are the least obvious, which teaches children to be more thoughtful, strategic, and open-minded.
Activity, Interactive Media, Illustration, Video