Megasite -Online manipulatives
Grades K-12

Illuminations

This must visit site includes standards, lessons, web resources and online manipulatives. Search by grade level and standards. Use with an LCD projector.

Megasite - Online manipulatives
Grades K-12

National Library of Virtual Manipulatives

Supported by the National Science Foundation this fabulous resource includes online manipulatives for math instruction organized by NCTM standards and grade levels (K-2, 3-5, 6-8, 9-12). Use with an LCD projector.

Problem Solving
Grades K-5

Aunty Math

This site features weekly math challenges. Each mystery focuses on a particular area of math reasoning and computation.

Problem Solving
Grades 3-6

Math Maven

The Math Maven is always finding herself in the middle of a fun new mystery and she counts on her "super sleuths" to crack the case.

Interactive Activities
Grades 5-6

Decimal Squares Interactive Games

Includes eight online activities that provide practice with decimal operations.

Shodor
K-12

Shodor Interactive

Includes learner activities, tools, lesson plans, and discussion notes correlated to NCTM standards.

PBS
Interactive

PBS Teacherline
Interactive

Includes 12 interactive math lessons that use geoboards, histograms, floor tiles, space blocks and more to solve mathematical problems.