Are you having trouble in understanding mathematical concepts and procedures? In case you are not informed, cut-the-knot.org is a web site that provides articles with detailed explanations and procedures for you to finally understand the concepts of mathematics.
They don’t ask for any requisite or payment for you to be able to read this articles or print them, you just select the topic you are having trouble to understand and the whole article will appear. The files include graphics and drawings, in some cases, and in this way make it clearer for the web visitor to understand. In this site there are published articles of topics such as arithmetic, algebra, geometry, logic and math games and puzzles among others. You are also able to see which math books they recommend and order them online through the link they provide you. So if you are having trouble to understand certain math’s concepts, then this site can be useful for you. 
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