Make 100 with only 9 numbers

Make 100 with ONLY 9 numbers

Hint 1:

They all have something in common

Hint 2:

The first 4 are numbers digits, the rest are not.

Hint 3:

+ =(use addition)

Hint 4:

They are the 1st ___(<-- what kind?) numbers

Answer

Well, I guess we are talking about the:

prime numbers. The sum of the first 9 equals 100 (2+3+5+7+11+13+17+19+23 = 100) and also the first 4 of them are also digits.