HEATKEYS

Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

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The scientific method refers to techniques used in scientific observation and measurement. How to create studies and experiments.

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High school level mathematics and computer programming lessons, activities and resources that are fun and challenging. Materials for students, parents and teachers.

Columbia University

Comprehensive encyclopedia of mathematics with 13,000 detailed entries. Continually updated, extensively illustrated, and with interactive examples.

Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.