Fourth grader solving 16-7=? with body system

You have 16 pigs; you give seven away; how many left? The 4th grader begins his solution of the problem with the ear-on-the-other-side (16). He indicates that this (ear (16) is given away, and corresponds to the thumb (1); the eye on the other side (15) is given away, and that corresponds to the index finger (2); the nose (14) is given away, and that's the middle finger (3)... the child proceeds to the shoulder (10) is given away and that's the forearm (7), leaving biceps (9), the answer.

Arithmetic problem presented at school

The teacher presents the class with an arithmetic problem. Note that some children begin to solve the problem using the body counting system. During this era, teachers were not from the Oksapmin area and knew little about indigenous knowledge systems of the community. (1980)

trade store owner solving 16-7=?

This film was taken in 1980. The man interviewed is a trade store owner who has developed new ways of using the body part counting system to solve arithmetic problems. He is presented with the problem that he has one kina and sixty toea and spends seventy toea. In the video, he represents one kina sixty toea as 16, distributing the value as shoulder (10) and wrist (6). Then from the side for which he has registered shoulder (10), he indicates that he spends the equivalent of seven or forearm (7).

Divanap Community School, 1980

A morning assembly at a community school (1980)