Numbers become colours and the arithmetic's becomes easier
WHAT IS IT? The La Ritabella is a table on which at each prime number a colour corresponds. This allows to identify every number with the colours which correspond to the prime factors of its factorization.
WHAT IS IT FOR? It helps:
to find all of a number's divisor
to calculate one or more numbers' greatest or lowest common divisor
to facilitate the fractional calculus.
WHO IS IT FOR?
Everyone,
to well comprehend a number's different concepts
The young that have learning disabilities as doing math, as a compensatory instrument in addition to the calculator.
FROM WHAT AGE? Starting from the secondary school, when the divisibility (prime factorization, greatest or lowest common divisor) and the fractional calculus are taught.
HOW TO USE IT?
In order to face an operation, the young:
identifies the operation's terms on the Ritabella
silently thinks with the coloured dots
easily reaches the numbered result.
LA RITABELLA IS A USEFUL INSTRUMENT
Rita Bartole, teacher of a secondary school, created to help the young with calculation difficulties and that Ghenos is proud to house on its web-site.
Author: Rita Bartole Graphics: Feel Italia Production: Feel Italia
11+ years Contents: 1 table Rules: Italian
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