La linea del 20 – in its new, improved and coloured illustrated edition – is the alternative to coloured rods in primary school Maths teaching and also in the preparation steps at Kindergarten.
The method valorises the intuitive skills of children who, according to recent research, are all born with an innate capacity for calculus and enter school with a lot of enthusiasm and information on numbers. Unlike coloured rods, which require lengthy instructions, The Line of 20 is a fun and easy method that can be used immediately.
It allows arithmetic operations within the number twenty and shows that these arithmetic operations are first of all simple and daily actions such as adding and taking away. Students use the tool as an extension of their own hands and as mental calculus in human beings has evolved through the use of hands, no other explanation is required.

The volume contains a complete syllabus for 1st class Maths including calculus and arithmetic problems, all presented according to the analogical approach. A separate 16-page instruction guide for parents or teachers goes with the main book and the tool.

The Line of 20 is designed for students with difficulties in mental calculus, but has proven very helpful also with partially sighted or hearing impaired persons, and also with foreign students. It can also be a wonderful aid for parents who want to teach their children maths before their actual entry to school.

The main title of the Bortolato Analogical Method is now available in English! Go to the web page dedicated to The Line of 20 »