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# Posts

### November 24, 2014

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No te mates, que no hay manera le decían los otros dos alumnos a su compañero. Habían venido a resolver unas dudas y, cuando ya se iban, uno preguntó cuándo aparecería otro reto en el blog. Es que tengo un amigo al que siempre se los cuento, dijo. No me pude resistir. Y ahí seguía, un buen rato después, intentando evitar triángulos tricolores. (Sigue leyendo...)
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Mi primera aportación a CarnaMat58 es este anuncio de conferencia: La magia de la Tabla Periódica [Conferencia]

### November 23, 2014

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updated section
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This simple fraction game has students estimation the portion of a circle shown by the given fraction. It then rewards them for their accuracy.

### November 22, 2014

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A worksheet to accompany the problem shown on The Curiosity Show (link below).
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By using each digit from 1492 exactly once, how high can you build the positive integers?
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Are you being cheated on pizza?
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A 7-year-old can understand this problem which completely baffles mathematicians.
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People say that a vector is "a quantity with both magnitude and direction." What does that mean?  This approach to vectors is too confusing. In this brief introduction allow me to demonstrate a more natural - and meaningful - approach to vectors. They're easy - and don't need to be made confusing.
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When will I use this? Meet professionals from a number of exciting fields who use mathematics in their jobs every day.
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XaoS is an interactive fractalzoomer. It allows the user to continuously zoom in or out of a fractal in a fluid, continuous motion. This capability makes XaoS great for exploring fractals, and it’s fun! Fractal zoomers on the iPad tend not to be free. This software is for Mac, Windows, Linux and is free. There is also a simplified online version.
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There are some great visualisations of mathematical concepts all over the net. This is a nice collection.

### November 21, 2014

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A couple of years ago, I committed to giving a series of lectures (a sort of mini-course) on measure theory at the Universidad de El Salvador. Not a big deal except for two challenges. (1) Teaching at a primarily undergraduate … Continue reading →
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This could form an interesting investigation for students studing the parabola. How can you use a parabola to multiply two numbers? Find out how. The YouTube description includes an online demonstration (Desmos) and there is a GeoGebra version.
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The shortest route for a spider to reach a fly seems obvious in this rectangular room, but Rob shows that it might be trickier than it seems.

### November 19, 2014

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Interactive to explore venn diagrams. Drag the numbers into the appropriate circle.

### November 18, 2014

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Art of Problem Solving {webinar_buttons.png} Enter the webinar room Ethnomathematics-RecordingMangahigh-RecordingRecording Full recording (text, voice, video)

### November 16, 2014

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La eclítica y el zodíaco, la nueva píldora de matemáticas donde mostramos como la invención del zodíaco griego se hizo en base a la eclíptica del Sol.

### November 14, 2014

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Marcus Du Sautoy explains a connection between Logarithms and Primes, and explains the connection between digital sound and Trigonometry.
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A ~3 min summary about integration and differentiation by well known mathematics presenter Marcus Du Sautoy.

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