wanu schinewano choz = 10 x (10 x 20).
This scale is in one sense wholly vigesimal, and in another way it is not to be regarded as pure, but as mixed.

Below 20 it is quinary, and, however far it might be extended, this quinary element would remain, making the scale quinary-vigesimal.

But in another sense, also, the Aino system is not pure.

In any unmixed vigesimal scale the word for 400 must be a simple word, and that number must be taken as the vigesimal unit corresponding to 100 in the decimal scale.

But the Ainos have no simple numeral word for any number above 20, forming all higher numbers by combinations through one or more of the processes of addition, subtraction, and multiplication.