What are three contributions by Egypt of the old kingdom?

1. Pyramids: The Ancient Egyptians of the Old Kingdom are best known for their iconic pyramids, which were royal tombs and a testament to their engineering and architectural prowess. The most famous of these is the Great Pyramid of Giza, built as a tomb for Pharaoh Khufu.

2. Hieroglyphics: The Egyptians developed a complex writing system called hieroglyphics, which used symbolic pictures and characters to represent sounds, words, and ideas. Hieroglyphics were used to record religious texts, royal decrees, and other important information.

3. Astronomy and Mathematics: The ancient Egyptians made significant advancements in astronomy and mathematics, which were closely linked to their religious beliefs and practical needs. They developed calendars based on the movement of celestial bodies and possessed knowledge of geometry and arithmetic, crucial for architecture and construction.