dy/dan » algebra
So you have here a fairly straightforward carnival estimation game, which I decided to complicate by filling up a smaller container with the same kind of (horrid) malted eggs and making that quantity known. I surveyed my students, my math-department colleagues, some of their students, my principal, and the central office staff. A little over 100 guesses all told. I tagged each guess with the following metadata:

Standards for Mathematical Practice
"Does this make sense?" Mathematically proficient students start by explaining to themselves the meaning of a problem and looking for entry points to its solution. They analyze givens, constraints, relationships, and goals. They make conjectures about the form and meaning of the solution and plan a solution pathway rather than simply jumping into a solution attempt. They consider analogous problems, and try special cases and simpler forms of the original problem in order to gain insight into its solution.

Tasks, Units & Student Work - Common Core Library NYC
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Factors, Multiples and Primes
14 Divisors Stage: 3 Challenge Level: What is the smallest number with exactly 14 divisors? Dozens Do you know a quick way to check if a number is a multiple of two? How about three, four or six?
Webcast - Beyond Slices of Pizza: Teaching Fractions Effectively
This webcast, Beyond Slices of Pizza: Teaching Fractions Effectively, was coordinated by The Center on September 23, 2008. Video from the webcast Complete video from the webcast. (no longer available)Additional video interview with Denise Mewborn: Fractions are everywhere in the real world (no longer available)

Problems of the Month
Problem solving is the cornerstone of doing mathematics. A problem that you can’t solve in less than a day is usually a problem that is similar to one that you have solved before. But in real life, a problem is a situation that confronts you and you don’t have an idea of where to even start. If we want our students to be problem solvers and mathematically powerful, we must model perseverance and challenge students with non-routine problems.

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Common Core State Standards
Review, Practice, & Mastery Sample Pages These are PDF documents.
MathVIDS! Home
Welcome to MathVIDS! A Resource for Teaching Mathematics to Struggling Learners MathVIDS is an interactive website for teachers who are teaching mathematics to struggling learners made possible through funding by the Virginia Department of Education.
The University of Arizona - Institute for Mathematics & Education
The Common Core State Standards in mathematics were built on progressions: narrative documents describing the progression of a topic across a number of grade levels, informed both by research on children's cognitive development and by the logical structure of mathematics. These documents were spliced together and then sliced into grade level standards. From that point on the work focused on refining and revising the grade level standards.