For the same reasons anyone needs one, for calculation and record.
The ancient Egyptians used the decimal number system.
Egyptians uses base 10 number system
At a guess, I imagine that the Egyptians used the number system in Egypt
False Apex
so they could trade with other places.
so they can trade,comunicate with other places
egyptians used number sense
The Egyptians developed a hieroglyphic writing system.
No. Egyptians did not invent numbers. Numbers used for counting were first used tens of thousands of years ago, before written history and thus before there are known civilizations. As for base or place number systems, the Myans are believed to be the first to create such a number system. It was base 60. Then the Egyptians invented a 10 base number system.
Heiroglyphics
no
The Egyptians wrote numbers using the Arabic numeral system (our system) and the Romans used the Roman numeral system. (IVXLCDM)