Along the same lines:

There are indigenous tribes in the rain forest who have no discernment between the colors yellow and green. Everything is in a stage of becoming the other, and they don't see it as a true difference in color, only difference in the stage of its life.

Numbers were necessary to make a logical order of things. Without numbers, could we have a functional society? I completely doubt it, because we would cease to be functional as a group. Even if there aren't named numbers, there is still a concept of them. When a tribe divides its kill, it separates it into what the group feels fair. There is a quantifiable fraction that everyone is entitled to. Whether it's a concept of this or is explicit, it exists.