Abacus
To develop an understanding of the main concept of the abacus as a counting tool for arithmetic; to make an abacus; and to demonstrate simple numbers, addition and subtraction. From the Chinese Historical and Cultural Project

Academy Curricular Exchange Mathematics Elementary (K-5)
A collection of lesson plans from Columbia Education Center Mathematics

CEC Mathematics Lessons

Data & Probability Lessons

Histograms and Bar Graphs
An introduction to histograms, bar graphs and the concept of class interval showing the students how data can be graphically represented.

Probability Lesson Plans From AskERIC

Probability and Sports
Students use the Internet to find topics in sports where probability is relevant. The lesson introduces some statistics and probability concepts by looking at practical questions that arise in professional sports.

What Did You Eat for Lunch?
Kindergarten students collect data about their own lunch foods. Each student chooses his or her favorite part of the day's lunch; the whole group discusses categories for these foods. Using one set of categories, the class sorts their favorite foods to create a large pictorial data chart.

Dinosaur Math For Grade 4 by Jan Rottner, Kings County Office of Education

Elementary Lesson Plans From Statistics Canada

Explorer SCR-TEC
A collection of educational resources: instructional software, lab activities, lesson plans, and student created materials for K-12 mathematics and science education. From the Great Lakes Collaborative and the University of Kansas UNITE group

First Grade Math Lessons AAA Math

Fractals:
A Fractals Unit for Elementary and Middle School Students
A collection of lessons for Grades4-8, using fractal geometry to introduce students to modern mathematical research and to reinforce the arithmetic and geometry skills. By Cynthia Lanius

Fraction Lessons

Fraction Facts
Introduces the students to fractions, including operations with fractions, converting fractions to decimals and percents.

Fractions
Elementary School Lessons & Materials for Teachers from the Math Forum

Fun Mathematics Lessons
By Cynthia Lanius of Rice University

Giant Steps Making Estimations in Measurement. Students make accurate measurements and estimations. From Encarta

Hold It! Children use beans to estimate capacity and become familiar with making reasonable instead of wild guesses. From Eduplace

K-6 Mathematics lessons Silver Burdett Ginn

Kindergarten Math Lessons AAA Math

Lesson Plan Ideas From the Kent School District, Washington
Kindergarten; Grade 1; Grade 2; Grade 3; Grade 4;
Grade 5; and Grade 6

Lesson Plans From the National Council of Teachers of Mathematics (US).
Contains three types of internet-based lesson plans:
i-Plan: Internet-Based Multi-Day Lesson Plan - Multi-day lesson plan consisting of sequenced learning activities that use the Internet
i-ME: Internet Mathematics Excursion - Single-day learning activity built around an Internet resource
i-Pub: NCTM Publication-Based Lesson Plan - showcases a small sample of NCTM publications that are immediately useful in the classroom.

Let's Measure! Core Knowledge

Math Lesson plans from CanTeach

Math at PBS TeacherSource
Contains lessons and activities at grade levels in the following topics: Data Analysis; Geometry; Measurement; Numbers & Operations; Patterns, Functions & Algebra; Problem Solving & Reasoning; and Statistics & Probability

Math Activities for Grades K - 12 Teachers
Activities are grouped for K-6, 7-8, and 9-12. They are written in a lesson plan format and ready for use. Developed at California Polytechnic State University in conjunction with NASA Dryden Flight Research Center