Sorry....Embarrassed......missed some zeros.......ummmmmm.........I meant to write One hundred thousand years ago, but it doesn't change the result. Take Homo Erectus for example. They lived from 2 million yrs ago up until they went extinct one hundred thousand years ago, could possibly be related to Homo Habilis and may have evolved from Australopithicus Sediba but in almost 2 million years didn't come close to our level of evolution in one hundred thousand years and were not linked to Homo Sapiens lineage. Neither are we directly linked to Homo Heidelbergensis or Homo Neanderthalensis, we just popped up a hundred thousand yrs ago and we have so far found no direct link back to Ardipithecus Ramidus of 4+ million yrs ago (a sort of ape like creature). I do say so far, archaeologists are still looking and finding new things every day throughout Africa. you cannot think in a simple line of this through this through this to Homo Sapiens. Like the various reptiles and birds, we cannot be directly linked to Lemurs, monkeys or apes but evolved side by side from similar but different mammals in different environments.
As far as teaching early humans.......I think you would have trouble with simple domestication let alone complex mathematics.