a fligolo
Solidus.
a prime square
Algebra
Verticies
a washer
Solidus.
A sphere is the correct terminology.
Yes, the hash tag symbol is also known as the pound sign or number sign.
A hemisphere would be the correct name.
Prime factors
hash
Octalthorp. Note that, in Britain the '#' sign is called 'hash' and isn't used as the number sign - we write 'No.' for number.
a prime square
Algebra
The name of the symbol is "pound sign" or "number sign". It is also known as an "octothorpe" or "hash symbol".
the largest number
The correct term is dividend. The number doing the dividing is the divisor and the answer is the quotient.