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# Posts

### March 10, 2014

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This package provides a self-directed learning sequence for students who are beginning the study of conic sections in Extension 2 Mathematics. It illustrates concepts and definitions through animations. Interactives allow students to explore relationships and basic properties.

### March 09, 2014

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Do you have Fibonacci or Lucas-patterned sunflowers in your garden? This article discusses the Fibonacci series in nature and how some sunflowers follow the Lucas series. Also discusses the contributions of Turing.

### March 08, 2014

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An ABQuiz on quadratics (student designed questions).

### March 07, 2014

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Last summer I had the great pleasure of visiting the Summer Program in Mathematical Problem Solving (SPMPS), a 3-week residential math enrichment program for rising 8th graders from schools in which at least 75% of the students qualify for free … Continue reading →
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Explaining the statistical concept of correlation through dance. From a series, Dancing Statistics.
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Explaining the statistical concept of variance through dance. From a series, Dancing Statistics.
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Explaining the statistical concept of sampling & standard error through dance. From a series, Dancing Statistics.
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Explaining the statistical concept of frequency distributions through dance. From a series, Dancing Statistics.

### March 06, 2014

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The graph is based on 74,476 prices from 3,678 pizza places around the US. Investigate how the price of pizzas changes with size and how much more pizza you get when you get a large.
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A lot of students struggle with more advanced mathematics because they lack basic arithmetic skills. Make a Guess Calculator allows students to practice these skills while they work on more advanced mathematical topics. With normal calculators, students are not required to try the problem on their own first. Make a Guess Calculator requires students to enter a guess before the calculator shows the answer. More in this blog post from the developer.
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A tediously accurate scale model of the solar system.

### March 03, 2014

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Whilst this is from the Veritasium science channel, it's a really great video to get students thinking about the assumptions they make when solving problems.

### March 02, 2014

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A scaffolded worksheet for finding one quantity as a percentage of another.

### March 01, 2014

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Number Rack facilitates the natural development of children’s number sense. Rows of colored beads encourage learners to think in groups of fives and tens, helping them to explore and discover a variety of addition and subtraction strategies. Also available as a free app for Apple iOS devices.
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Number Pieces helps students develop a deeper understanding of place value while building their computation skills with multi-digit numbers. Students use the number pieces to represent multi-digit numbers, regroup, add, subtract, multiply, and divide. Also available as a free app for Apple iOS devices.
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Number Line helps students develop a deeper understanding of place value while building their computation skills with multi-digit numbers. Students use the pieces to represent multi-digit numbers, regroup, add, subtract, multiply, and divide. Also available as a free app for Apple iOS devices.
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Geoboard is a tool for exploring a variety of mathematical topics introduced in grades K-8. Learners stretch bands around pegs to form line segments and polygons and make discoveries about perimeter, area, angles, fractions, and more.

### February 26, 2014

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Mi aportación para la Edición del Carnaval de Matemáticas, la Edición 5.1: Rey Pastor alojada en el Blog de Tito Eliatron Dixit, desde el Blog Que no te aburran las M@tes:http://matesnoaburridas.wordpress.com/2014/02/26/calculadora-wiris-cas-on-line/Mucha suerte a todos con vuestras entradas, espero que la mia os guste.
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mi segunda aportación al CarnaMat51 es la entrada Metales Imaginarios en la que comento una curiosa propiedad del número de oro relacionada con el seno complejo. Además, extendemos esta propiedad a todos los números metálicos.
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La Segunda Guerra Mundial. Un campo de trabajos forzados. Vagonetas cargadas de ladrillos que, en los cruces de raíles, traquetean y pierden parte de su carga. Un matemático soldado que se pregunta si podría haber menos cruces. Ésta es la historia de un problema tan desafiante como fácil de entender, que lleva sin resolver 70 años pese a que se conjetura una solución muy sencilla. (Sigue leyendo...)

### February 25, 2014

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Os dejo mi primera aportación a ésta edición del Carnaval: http://icaraideas.blogspot.com.es/p/astronomia-y-astrofisica.html Un calendario lunar de hace 30.000 años. Quizás el primer calendario de nuestros antepasados. Buenas noches

### February 24, 2014

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Febrero es mes de carnaval festero, de carnaval matemático y mes de Olimpiadas Matemáticas. Este año se cumple el vigésimo quinto aniversario de las Olimpiadas Matemáticas para alumnos de segundo de E.S.O. tanto a nivel nacional como para la de nuestra provincia de Albacete. Parece ser que esta costumbre de las bodas de plata tiene su origen en la Alemania medieval. Cuando una pareja llegaba a los veinticinco años, la esposa era coronada con una diadema […]
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Hola a todo el mundo.Esta es mi participación en esta edición del Carnaval, de nuevo desde el blog "La Ciencia y sus Demonios".Espero que os guste.Un saludo.http://lacienciaysusdemonios.com/2014/02/24/el-problema-del-reparto-de-la-apuesta/
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Mi primera aportación a la Edición 5.1 Rey Pastor del Carnaval de Matemáticas es el vídeo de la conferencia de Antonio Pérez Sanz el pasado 19 de febrero en Sevilla.
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Percentile growth charts for children's height and weight. An example of line graphs, continuous data.

### February 21, 2014

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Problem: evaluate the following sum… $$\sum_{k=0}^{\infty}\dfrac{(-1)^{\frac{k(k+1)}{2}}}{(2k+1)^2}$$ This is unusual because the $-1$ is raised to the $k (k+1)/2$ power, rather than the usual $k$th power. On the surface, this problem may look hopeless, but really, it is all about determining the pattern of odd and even numbers from the sequence $k (k+1)/2$, which turns out […]
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Deane and Rob discuss the probability involved in coin tossing with two coins. They extend the discussion to the probability of certain dates falling on particular days of the week.

### February 20, 2014

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El protagonista de esta historia no es Carl Friedrich Gauss, príncipe de los matemáticos; sino el misterioso personaje autodenominado Sr. Le Blanc, cuya decisiva intervención salvó la vida del insigne matemático alemán. Aportación para la Edición 5.1 del Carnaval de Matemáticas cuyo anfitrión es Tito Eliatron Dixit. Leer completo en: El misterioso Señor Le Blanc que salvó la vida de Gauss #CarnaMat51

### February 18, 2014

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Well, some integrals are not all that hard to evaluate in principle. The one I am posting here should be an open and shut application of the residue theorem, using the unit circle as a contour. The form of the integrand, however, should give a little pause. It turns out that actually computing residues on […]