Mayan Mathematics - The Mayans had one of the most advanced number systems in the world at its time. It was a base-20 system (kind of) that also relied quite heavily on the number five. Some think that this is due to five fingers and five toes on each hand and foot. Their system relied on three different symbols. A “pebble” (small black circle) was used to represent the ones place. Learn more: https://3010tangents.wordpress.com/2015/02/25/mayan-mathematics/
TippenAkademie - das 10 Finger-System endlich im Griff
10-Finger-schreiben auf der Tastatur. Produktivität steigern. schnell und einfach das System lernen. Tipps für Blogger.
10 Finger System tippen lernen mit Maschinenschreiben Lernprogramm