The Romans used special tables for multiplication, similar to the Egyptians and Babylonians. The …
Month: March 2016
How to use the abacus?
Egyptians, Babylonians and Greeks used the abacus even before the Romans. The Chinese and Japanese were also familiar with such simple counting machines. …
How can you multiply with your fingers?
The Romans once conquered most of the then known world; for the art of mathematics, however, they have chosen …
What is an ideal number?
In one number, which is equal to the sum of all of its possible divisors (without herself) is, the Greeks sensed a secret. …
What are square numbers?
Any square can be formed with game pieces or marbles, The first square has two rows of each 2 Stones, …
What are triangular numbers?
Other Greeks explored the magic of numbers. The students of Pythagoras found, that he, when adding consecutive numbers, Rules about …
Who measured the distance to the moon first??
In the second century BC. Chr. calculated Hipparchus, a famous astronomer in Alexandria, the earth-moon distance. His calculations showed, that the …
How did you measure the size of the earth in the past??
The Greek mathematician Eratosthenes (a 225 v. Chr.) was librarian in the famous great library at Alexandria in Egypt. Is …