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"Looking for Mathematical Practices aligned to the CCSS? You can find them through the ADVANCED SEARCH feature. Simply click on "advanced search" (found in the search box area) and a search criteria"

This interactive Flash applet helps students explore concepts of ratio and proportion. It displays two containers, each with its own tap that can be set to deliver different-colored liquids in units of 1 to 10. A main tap can be set to deliver multiples of the amounts on the left- and right-hand taps. Proportion can be modelled using the drain container, which receives whatever is in the left- and right-hand containers.

"In this chapter, we will first prove the Pythagorean Theorem and its converse, followed by analyzing the sides of certain types of triangles. Then, we will introduce trigonometry, which starts with the tangent, sine and cosine ratios. Finally, we will extend sine and cosine to any triangle, through the Law of Sines and the Law of Cosines. "

"Life outside the classroom for the seventh grader ( age 12). Why does mathematics exist? Every learning community has a need to quantify some aspects in its environment. Its language(s), economic and social environment determines how much content will be adopted and adapted to meet those aspects. Unfortunately increase globalization is bringing about changes. "

"K-12math.info is a bibliographic information system used by elementary and secondary school mathematics material developers, teacher trainers, resource professionals and home schooling parents. K-12math.info uses a list of 1,000 of the most common terms that appear in elementary and secondary school student editions of mathematics textbooks. It tracks which textbook contain which terms, on what page (for OER materials a link to where the term can be found), for what grade level, and how the term is being used. Information has been collected since the early 1970's to the present Open Education Resource (OER) textbooks series. And displayed in a spreadsheet format. "

"7puzzle is a unique product as the contents of the game are kept in an eco-friendly distinctive black/lilac bag. This keeps the playing board clean and tidy, making it extremely difficult for the owner to lose the playing pieces. The playing board is a 7 by 7 grid of 49 squares, each containing a number, colour and shape. When taking on the challenges, players must place all of the 14 playing pieces (7 of which are straight and 7 angled) onto the board, therefore leaving seven spaces. The intention is that everything on the board will be covered up, except seven of a certain element, which may be a particular colour, shape or type of number, depending on the challenge undertaken."

"Elements 114 and 116 have been officially added to the periodic table, becoming its heaviest members yet. They both exist for less than a second before decaying into lighter atoms, but they bring researchers a step closer to making even heavier elements that are predicted to be stable for decades or longer, forming a fabled "island of stability" in the periodic table."

"Hans Rosling says there's nothing boring about stats, and then goes on to prove it. A one-hour long documentary"

"Long distance space travel could create the ultimate 'killer entrance', devastating your destination and anything around the arriving spacecraft, according to calculations by Professor Geraint Lewis and two honours students from the University of Sydney."

"998,001 and its Mysterious Recurring Decimals - Numberphile "

"20th-century mathematical genius Amalie Noether. Emmy Noether's theorem united two pillars of physics: symmetry in nature and the universal laws of conservation. Albert Einstein called her the most "significant" and "creative" female mathematician of all time, and others of her contemporaries were inclined to drop the modification by sex. She invented a theorem that united with magisterial concision two conceptual pillars of physics: symmetry in nature and the universal laws of conservation"

"Today scientists, mathematicians,and artists are embracing the idea of Fractals. Snowflakes are examples of fractals in nature. Fractals are patterns that are self similar within itself. The best way to understand Fractals is to actually create a fractal. Koch's Snowflake Curve is an example of a fractal. "

"A fractal is an object or quantity that displays self-similarity, in a somewhat technical sense, on all scales. The object need not exhibit exactly the same structure at all scales, but the same "type" of structures must appear on all scales."

"Sure, there are plenty of apps you can use in education. There are even apps created specifically for use in education. Apple has a whole category dedicated to education in the App store. But how do you really know which ones are worth downloading, or possibly even paying for?"

""Some infinities are bigger than other infinities" "

"Matter & Interactions is a textbook by Ruth Chabay and Bruce Sherwood that emphasizes a modern perspective on the calculus-based introductory physics curriculum taken by engineering and science students. It engages students in: Starting analyses from fundamental principles rather than from secondary formulas. Making macro-micro connections, based on the atomic nature of matter."

Numberphile is a quirky exploration of the world of mathematics and numbers. Each video explores strange facts, properties and curious stories about different numbers - from zero to infinity (and a few outside this range). The films feature experts across a range of sciences and are produced by independent video journalist Brady Haran.

Using a protractor to measure angles

"The Antikythera Mechanism: http://bit.ly/fm4oFK is the oldest known scientific computer, built in Greece at around 100 BCE. Lost for 2000 years, it was recovered from a shipwreck in 1901. But not until a century later was its purpose understood: an astronomical clock that determines the positions of celestial bodies with extraordinary precision. ((In 2010, we built a fully-functional replica out of Lego. ((Sponsored by Digital Science: http://www.digital-science.com/ a new division of Macmillan Publishers that provides technology solutions for researchers. Available under a CC-BY-3.0-Unported license. Antikythera Mechanism Research Project http://www.antikythera-mechanism.gr"