1.28 = 128 * 10^-2
128 * (1/10^2)
128 / 10^2
128 / 100
1.28
Because, it's literally the same thing mathematically if you worked it out. Though, as I'm sure you're aware, it's just a much shorter and cleaner way of writing out large or small numbers.
You would have to divide 16.50 into 3 then put your answer down hope this helps
I want to say about 27% but I am not completely sure
You can see the answer from the picture