# Binary

## A brief history of numerical systems

1, 2, 3, 4, 5, 6, 7, 8, 9... and 0. With just these ten symbols, we can write any rational number imaginable. But why these particular symbols? Why ten of them? And why do we arrange them the way we do? Alessandra King gives a brief history of numerical systems.

## How computer memory works

We bet, for your high schoolers you won't get a simpler explanation on how computer memory works.

Follow the video with this short quiz.

Extend their learning with a an open ended discussion by posing the following question:

## How to Subtract By Adding

Minute Physics invites you to try this with your learners & have fun!

## Fun with dice

Dice (singular die - meaning "something which is given or played with")are small objects with multiple resting positions. They are mainly used for generating random numbers but as this video shows can have other uses in a classroom too!

## Tens and Ones

Here are some tried and tested “Modules” for learning different number concepts. Primary school teachers should find it simple enough to build the exercises into their regular teaching routines, as the method requires easily gathered materials and little organization.

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