What advancements did ancient egyptians make in math and science

The system of ancient Egyptian numerals was used in Ancient Egypt around 3000 BC until the early first millennium AD. It was a system of numeration based on the scale of ten, often rounded off to the higher power, written in hieroglyphs, but they had no concept of a place-valued system such as the decimal system is. thats something in math. 

Require the nobles and clergy to pay taxes.