What is the earliest origin of mathematics? Agriculture? Business? Math? Divination?

Agriculture. Mathematics, like other branches of science, is an intellectual accumulation developed through human social practice and production activities under certain social conditions. Its main content reflects the quantitative relationship and spatial form of the real world, as well as their relationship and structure. This can be confirmed from the origin of mathematics.

The Nile in ancient Africa, the Tigris and Euphrates rivers in West Asia, the Indus and Ganges rivers in Central and South Asia, and the Yellow and Yangtze rivers in East Asia are the birthplaces of mathematics. Due to the need of agricultural production, the ancestors in these areas have accumulated rich experience from long-term practical activities such as irrigation, measuring field area, calculating warehouse volume, calculating calendars suitable for agricultural production, and related wealth calculation and product exchange, and gradually formed corresponding technical knowledge and related mathematical knowledge.