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com 2 algarismos

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algoritmo da divisão (2 algarismos no divisor) aula 2- 4º ano

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Brincar à tabuada.

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A tabuada dos animais.

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Símbolos matemáticos

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An excellent summary of historical information about the origin of many common mathematical symbols is the Wikipedia article on the subject. For those who want to dive deeper, the classic study by Florian Cajori is a great source.

More information about the life of Robert Recorde can be found at the MacTutor History of Mathematics archive.

Part of the inspiration for this lesson came from Richard Feynman's fascinating anecdote about inventing his own mathematical notation in high school. It is found in one of his essays, titled "He Fixes Radios by Thinking!" collected in Surely You're Joking, Mr. Feynman.

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Where do math symbols come from? - John David Walters

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Math is full of symbols: lines, dots, arrows, English letters, Greek letters, superscripts, subscripts ... it can look like an illegible jumble. Where did all of these symbols come from? John David Walters shares the origins of mathematical symbols, and illuminates why they're still so important in the field today.

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Será que se pode dividir um número por 0?

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The Khan Academy also has an awesome educational lesson on this topic: Why dividing by zero is undefined! Mathforum.org also answers the same question!

What are some other problems associated with zeros? Learn more by watching this video from Numberphile: Problems with Zero.

Numbers can be fascinating! Look at this article: The Secret Magic of Dividing by Zero!

Love mathematics? TED-Ed has a number of amazing lessons that involve all types of math! Click here and find your next lesson!

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In the world of math, many strange results are possible when we change the rules. But there's one rule that most of us have been warned not to break: don't divide by zero. How can the simple combination of an everyday number and a basic operation cause such problems?

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A Magia da Matemática

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A matemática nos números, figuras e na música

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A matemática nos números, figuras e na música

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A magia da matemática está por todo o lado. Com ela podes ter um 11 mágico sem estar a jogar futebol, tirar meias luas de triângulos ou sentir a música quando te sentas, usando um computador que te guia numa viagem sonora pelo tempo.

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Números primos

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A vida infinita do PI

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The infinite life of pi - Reynaldo Lopes