One must distinguish between two types of calculators: analogue and digital working. The word "digital" means, …
Calculate with electronic – Arithmetic machines
A modern data processing system consists of several electronic devices. Mit Spezialschreibmaschinen wird die gestellte Aufgabe auf Karten oder Papierstreifen in die …
How to read encrypted price labels ?
Sometimes when shopping, you discover mysterious signs on the packaging. Usually the trader's secret code consists of letters, die ihm …
How to make a magic square?
The method shown here can be applied to magic squares of any size, soweit sie eine ungerade Zahl von waagerechten und …
What is a magic square?
Magic squares have been more than people 2500 tied up for years. Actually, there is nothing magical about these squares, because …
What is a cryptogram?
Replacing numbers with letters is called cryptography, and a cryptogram is a math problem, in der Buchstaben für …
How to do a square code?
It's not difficult at all, to create a square code. We write down any short message and count the number of letters. …
Code Form
Special and important messages
and messages are often encrypted or "written in code.". There are many opportunities, at Ver- and …