You can argue all day over whether math is a human creation or a human discovery. Either way, we come into this world pre-loaded with innate number sense.
Our brains naturally extract numbers from the surrounding environment in much the same way it identifies colors. Studies show that while infants have no grasp of human number systems, they can still identify changes in quantity. Three cheesy goldfish vs. six, there's a definite difference.
It might not feel like it when we're doing our taxes or splitting a restaurant tab, but we're all born accountants. Babies can estimate quantities and distinguish between more and less. It's all logarithmic thinking.