## Common Core State Standards for Mathematics

Grade(s) K resources related to the following standard:
Counting and Cardinality
Know number names and the count sequence.
1. Count to 100 by ones and by tens.

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This FAQ page from the Teacher2Teacher service at The Math Forum @ Drexel contains links to many resources offering ideas for celebrating the 100th Day of School. Resources include T2T discussions, children's literature, teacher resource books, and web sites.
Activity, Lesson Plans, Reference Materials, Community
In this 8-lesson unit students use buttons to explore logical and numerical relationships that form the conceptual basis for understanding addition and subtraction operations. Topics include counting, ordinal numbers (and relative position), classification (attributes), relationships between numbers, addition of sets, commutativity of addition, sums to 10, fact families (including subtraction), three models of subtraction ("take away", comparative, missing addend), and bar graphs. Includes student activity sheets and a link to an online graphing applet.
Activity, Instructor Guide/Manual, Lesson Plans, Unit of Instruction
This iOS app (\$) is a collection of 18 activities providing practice with a wide range of early math skills involving number, shape, and measurement.
Activity, Interactive Media, Mobile App
Grade Level: Pre-K, K, 1, 2
This interactive 100 grid has a variety of open-ended uses. Users can "make" as many counters as they choose from among three different kinds, and then drag them onto the grid, allowing any number to be covered by up to 3 different markers at one time. An Ideas page offers possible tasks and games suited to the applet.
Activity, Interactive Media
Grade Level: K, 1, 2, 3, 4, 5
This webpage discusses the extension of children's counting skills beyond 10. It illustrates the difficulties resulting from the irregularity of English number names in the teens as well as the challenge of maintaining one-to-one correspondence with larger numbers. Several teaching strategies and activities are suggested to help students overcome these difficulties.
Activity, Instructional Strategy, Reference Materials, Article
In this 5-minute video Laura Domalik defines number sense and provides instructional strategies for counting and vocabulary, including counting on, counting back, one more than (+1), one less than (-1), basic fact concepts of +1 and -1, and missing addends. She demonstrates a game called Garbage, which can be played alone or with a partner.
Activity, Game, Instructional Strategy, Video
This narrative document describes the progression of Counting and Cardinality and Operations and Algebraic Thinking across the K-5 grade band. It is informed both by research on children's cognitive development and by the logical structure of mathematics. The document discusses the most important goals for elementary students that of understanding and using numbers. The focus is on the basic operations—the kinds of quantitative relationships they model and consequently the kinds of problems they can be used to solve as well as their mathematical properties and relationships.
Reference Materials, Article
Grade Level: K, 1, 2, 3, 4, 5