The Webinar on Mental Calculation with Your Fingers took place on Wednesday, May 19th, 2021 from 12 pm until 1 pm, with Robert Escribano, member of the Museum of Mathematics of Cataluña (MMACA) and FUNDAPROMAT volunteer who manages our Twitter account, as our invited speaker. This virtual event was free and open to the general public.
The invited speaker explained how to find the product of two numbers of the same half-decade (i.e. 6-10, 11-15, 16-20, 21-25, 26-30…) using only your fingers. Robert Escribano then applied this technique to calculate the square of numbers. The speaker also described why this algorithm works, both geometrically and algebraically. This virtual event was co-organized with the Museum of Mathematics of Cataluña (MMACA).
