0.9 10 is the largest one-digit number, o.99 10 is the largest two-digit number, 0.999 10 is the largest three-digit number, etc. The largest value in a given base is always less than the base; 9 for base 10, 6 for base 7, 37 for base 38, 1 for base 2. The problem is that the whole idea of a base system breaks down in “base 1”. The base 1 number system is kind of a mess and, outside of tallying, isn’t worth using. For example, when we write the number 0.999… in base 10, what we explicitly mean isThe same idea is true in any base B, .