Question

The value of one in 3.100

Answer 1

well, 1 is in the tenths place, which means it's equal to 1 tenth, or 1/10.

Answer 2

I'm just going to pop this in here for future reference:

The value of this place is 1, a whole number, - 1.000
The value of this place is one tenth or - 0.100
The value of this place is one hundredth or - 0.010
The value of this place is one thousandth or - 0.001