## Mathematical theory

Learn how to prove a math theory! https://www.youtube.com/watch?v=S0DSM-EkQE8&

## Estimate large numbers

Here's a great way to estimate enormous numbers!

## Solve Problems Backwards

Retrograde analysis is a style of problem solving where you work backwards from what you want.

## Site with Math Quizzes

A+ Click has fun math tests for grades K-12.

## You Can Solve Algorithms

An algorithm is a mathematical method of solving problems. Though computers run algorithms all the time, humans can also solve problems with algorithms. http://www.youtube.com/watch?v=6hfOvs8pY1k

## Jean-Baptiste Michel

What does mathematics say about history? According to TED Fellow Jean-Baptiste Michel, quite a lot. From changes to language to the deadliness of wars, he shows how digitized history is just starting to reveal major underlying patterns....

## The History of Keeping Time

Where did time-telling come from? What are time zones and why are there so many of them? Get the answers to these questions and more in this journey through the history of time -- from sundials to hourglasses to modern clocks. Lesson by Karen Mensing, animation by Avi...

## One is one…or is it?

## Telling Time for Kindergarteners

This covers hours in the day, time to the hour, with both anaolog and digital clocks represented.

## Daylight Saving Time Explained

A brief history and explanation of the annual madness that is daylight saving time.

## How do Japanese multiply??

Well a rather interesting video ! How japanese multiply, a rather simple mathematic computation,or not?

## The Aztecs and Math

School Project to describe math of the Aztecs.