MathWorld provides a huge mathematics encyclopedia detailing the concepts of geometry, algebra, calculus, discrete math, number theory, and other math topics--complete with formulas, diagrams, examples, and references for thorough...

This lesson is about counting by fives from AAAmath.com. There are separate sections for learning, practice, playing a game, and exploring more about skip counting.

This is a useful site with lesson plans, problems of the month, etc.

An excellent compilation of activities that engage parents and children in math explorations at home. Detailed lessons covering a wide range of math topics such as fractions, measurements, money, data collection, and math in newspapers....

Make grocery shopping a mathematical experience. Parents and children explore a variety of math concepts through this collection of engaging math activities. Lesson are presented in varying levels of difficulty, offer "Parent Pointers"...

This lesson is about counting by fours from AAAmath.com. There are separate sections for learning, practice, playing a game, and exploring more about skip counting.

This lesson is about counting by twos from AAAmath.com. There are separate sections for learning, practice, playing a game, and exploring more about skip counting.

This lesson is about counting by threes from AAAmath.com. There are separate sections for learning, practice, playing a game, and exploring more about skip counting.

Parents and children explore math in the world around them in this collection of math activities. Simple, engaging, and fun, these lessons offer learners the opportunity to discover math even when they're "on the go." An excellent...