When looking for math activities, information, or new ideas I have a few “core” people I follow.

Here is the short list:

Bill McCallum: http://commoncoretools.me/author/wgmccallum/

Donna Boucher: http://mathcoachscorner.blogspot.com/

Dan Meyer: http://blog.mrmeyer.com/

Marilyn Burns: Math Solutions

Jennifer Bay Williams: Pearson

The “core” publications I turn to are:

Carpenter’s Work: Children’s Mathematics: Cognitively Guided Instruction

Thinking Mathematically: Integrating Arithmetic and Algebra in the Elementary School

Levi & Empson: Extending Children’s Mathematics:Fractions and Decimals:Innovations in CGI

Van de Walle Series: Elementary and Middle School Mathematics: Teaching Developmentally

Teaching Student Centered Mathematics: Developmentally Apporpriate Instruction for Pre-K-2

Teaching Student Centered Mathematics: Developmentally Apporpriate Instruction for Grades 3-5,

Teaching Student Centered Mathematics: Developmentally Apporpriate Instruction for Grades 6-8

Parrish: Number Talks: Helping Children Build Mental Math and Computation Strategies

NCTM’s Series: Developing Essential Understandings (all grades)

The “Core” Sites and Resources I commonly refer to are:

This list is by no means exhaustive but if you are looking for quality math materials aligned to the “Core”, it is a good place to start.