## In the mirror

I saw my face in the mirror, in passing, and it was someone else. I didn’t recognize the eyes, or the hair, or the point of the nose. But that wasn’...

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# Month: April 2013

## In the mirror

## 0.999… = 1 and Zeno’s Paradox

## Negative numbers squared

## 10101 and 11011 are never prime

## Just forget my Dear Aunt Sally

## Multiplying Polynomials

## Hero’s Formula and Mirror Triangles

I saw my face in the mirror, in passing, and it was someone else. I didn’t recognize the eyes, or the hair, or the point of the nose. But that wasn’...

Overview One surprisingly difficult concept for many students of mathematics is understanding that 0.999… (more properly depicted as \(0.9\overline{9}\)),...

Background Mathematical conventions represent the linguistic aspect of mathematics. One of the strengths of modern mathematics is the way in which we can repres...

One particularly tricky aspect of number sense is being able to separate the abstract notion of value from more concrete visual representations of numbers, and ...

The purpose of a mnemonic is to make something easier to remember. Roy G. Biv represents the major colors of the spectrum (Red, Orange, Yellow, Green, Blue, Ind...

The traditional way of teaching the multiplication of binomials is FOIL: First, Outside, Inside, Last. For instance: \[(x + 3)(2x – 5) = (x)(2x) + (x)(-5)...

Here’s a problem with an interesting solution. You’re given two triangles, T1 and T2. The sides of T1 are 25, 25, and 30. The sides of T2 are 25, 25...