FEATURES 
Fluency with Basic Addition Gina Kling Applying known facts to derive unknown facts results in efficiency, flexibility, and an understanding of number combinations for young students. 
Games to help students learn basic addition facts in meaningful ways

Learning to Write about Mathematics Renee Parker and M. Lynn Breyfogle This studentfriendly rubric helped improve third graders’ competencies when explaining solution strategies in writing. 
Rubric for Learning to Write about Mathematics

Second Look: Writing about Mathematics

Enriching Number Knowledge Nancy K. Mack Exploring number systems of other cultures helps students deepen mental computation fluency, knowledge of place value, and equivalent representations for numbers. 
Game directions and number cards

Sift like Eratosthenes Sandy Buczynski, Jennifer Gorsky, Lynn McGrath, and Perla Myers The concrete, pictorial, and abstract methods of this lesson give students access to investigate, isolate, define, and use prime numbers. 
Activity sheets  Rectangular Arrays
