The Egyptians only used addition and subtraction and didn’t use abstract theorems to calculate their numbers, instead they used tangible everyday objects – such as the number of bricks that will be needed, how much will be needed to fill a jar, etc. These objects were standardize at a very early date so would supply accurate results for the Egyptians. They had no concept of zero but did use fractions (written by using an ‘R’ with a number under it i.e. 1/… )