My post for today on African indigenous language is on counting. There is much to say on the many complex numeral systems found in West Africa, but one of their areal characteristics is all languages I’m aware of have two different ways of counting. I will get back to later to ‘normal’ numbers and the semantic underpinning of numbers used in counting objects. But today, I focus on the different way of counting money that is attested in these languages. When expressing a currency amount, the base number needs to be multiplied by five in order to arrive at the denominational amount. For instance, if I buy tomatoes for 100 Francs CFA, the price in Wolof, Bambara, Jalonke, Gujaher, etc., would be expressed with the number twenty. If the expression of the equivalent of 5,000 in monetary terms is desired, this would be the number 1,000. The probable reason for this dual system is that a five-francs piece has been the smallest coin in circulation since colonial times, so this became equivalent with one (unit of currency).
Think about the mental gymnastics for learners of these languages which don’t have a different counting system for money! It makes haggling a high-risk enterprise… And it would be really interesting to study how the two systems are acquired by children, and whether they help their multiplication and division skills.