How did people count before numbers were invented?

Numbers feel like they've always been here — 1, 2, 3 — but they haven't. Thousands of years ago, people had no words for "five" or "twenty." No symbols. No math class. And yet they absolutely needed to keep track of things. How many sheep came back from the field? How many days until the full moon? How many sacks of grain to trade?
The earliest trick was one-to-one matching. You didn't count your sheep — you matched them. When the flock left in the morning, you grabbed a pile of pebbles and dropped one pebble into a pouch for every sheep that walked past. At sunset, you pulled out one pebble for each returning sheep. If pebbles remained in the pouch, a sheep was missing. No numbers needed. Just a physical mirror of the flock.
