Which value is the same as 2 tenths?

In a column proof the right column states your reasons

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

Henry's butcher shop uses an electronic scale that measures to 1/100 of a pound. which is the most accurate measurement based on the limitations of the scale that might be found on a package of meat sold by henry?