# Free lessons in arithmetic, algebra, geometry, trigonometry and calculus.

Decimals - Tenths, Hundredths and Thousandths 0.5, 0.7 and 0.2 are decimals or decimal numbers. Divide 1 whole into 10 equal parts. The dot in a decimal is called a decimal point . In the decimal form, each part has a value equal to 0.1 (read as zero point one ). Dave's short course in trigonometry Table of Contents Who should take this course? Trigonometry for you Your background How to learn trigonometry Applications of trigonometry Astronomy and geography Engineering and physics Mathematics and its applications What is trigonometry? Trigonometry as computational geometry Angle measurement and tables Background on geometry The Pythagorean theorem An explanation of the Pythagorean theorem Similar triangles Angle measurement The concept of angle Radians and arc length Exercises, hints, and answers About digits of accuracy Chords What is a chord? Ptolemy’s sum and difference formulas Ptolemy’s theorem The sum formula for sines The other sum and difference formulas Summary of trigonometric formulas Formulas for arcs and sectors of circles Formulas for right triangles Formulas for oblique triangles Formulas for areas of triangles Summary of trigonometric identities More important identities Less important identities Truly obscure identities

Open-Ended Math Problems Open-Ended Math Problems This site is for the specific purpose of preparing Middle School students for OPEN-ENDED problem solving on standardized tests. We have divided each month into the five strands from the Philadelphia math standards:Number Theory Measurement Geometry Patterns, Algebra, and Functions Data, Statistics, and Probability There are three levels of difficulty for each standard. Math courses At Mathplanet.com you can study math online - for free. If you are studying at high school or are preparing for college this is the perfect place for you. We have decided to divide our material into four math courses: Pre-algebra, Algebra 1, Algebra 2 and Geometry - on these pages you will find all the theory needed to complete your math studies in respective field. We use state of the art teaching methods including up to date examples and video lessons. Each math course is divided into different fields and under each field you will find different lessons including theory, examples and video lessons.

Interactive Teaching Programs Mathematics TopicBox.net - free teacher resources for every UK primary school teaching topic A collection of Maths tools for the whiteboard. Developed by the National Numeracy Strategy, they seem to have fallen out of favour lately and are very hard to find on the monstrous DCSF website. Which is where TopicBox comes in... Interactive Mathematics Online As of July 1, 2013 ThinkQuest has been discontinued. We would like to thank everyone for being a part of the ThinkQuest global community: Students - For your limitless creativity and innovation, which inspires us all. Teachers - For your passion in guiding students on their quest. Partners - For your unwavering support and evangelism.

Practice skills needed on the Algebra II end of course assessment <p><a href=" Menu by Deluxe-Menu.com</a></p> a Algebra 2 Maths Inquirers Discovering Trigonometry Back to Dave’s home page Q: What is trigonometry?A: Trigonometry is the study of how the sides and angles of a triangle are related to each other. Q: WHAT? Back to Front Maths Trigonometry: A Crash Review Trigonometry: A Crash Review Unfortunately, for much of this subject, there is no substitute for brute memorization. This course is often used as pre-calculus. "Algebra masters" will have a much smaller memorization load than other students. [I mean College Algebra, not the higher-math version.] Trig Cheatsheet

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