Around 3000 BC Egyptian had hieroglyphs based writing system. Hieroglyphs are the pictures representing words. By a little picture of a bird they would donate the word “bird”, but without further development this system writing cannot represent many words.
Ancient Egyptians was use to spoken sound of words to demonstrate the idea with English sentence, for example “I hear a dogs’ barking” it might be represented by “an eye” or “an ear”.
But the same symbol might means something different, may be “an eye” means “see” and “an ear” means “sound”.
Egyptian had a system of bases 10 in hieroglyphs of numerals. This shows that they has separate symbols for unit, ten, hundred, thousand, the thousand, hundred thousand and million.
Here are the numeral hieroglyphs
If we try to compose the number 276, we need fifteen symbols, two symbols of "hundred", seven symbols of "ten", and six symbols of "unit". The numbers thus appeared as:
276 in hieroglyphs.
4622 in hieroglyphs.
The above examples are seen on The above examples are seen on a stone figured from Karnak that is around 1500 BC. As we can see easily, addition of numeral in hieroglyphs is easy. One just adds the individual symbols, but ten copies of a symbol be replaced by a single symbol of the next higher value.