Explanation:
in a number like 125,734,016
the right most position has the weight 10⁰ = 1
so, 6×1 = 6.
the second right most position has the weight 10¹ = 10.
so, 1×10 = 10
the third right most position has the weight 10² = 100.
so, 0×100 = 0
the 4th right most position has the weight 10³ = 1000.
so, 4×1000 = 4,000
the 5th right most position has the weight 10⁴ = 10000.
so, 3×10000 = 30,000
the 6th right most position has the weight 10⁵ = 100000.
so, 7×100000 = 700,000
the 7th right most position has the weight 10⁶ = 1000000.
so, 5×1000000 = 5,000,000
the 8th right most position has the weight 10⁷ = 10000000
so, 2×10000000 = 20,000,000
and so on.
as we can see, the 2 (the 8th most position from the right or the second position from the left) has the value of 20,000,000.