The molecular weight of CaCO3 is 40 g/mole for the Ca + 12 g/mole for the C + 48 g/mole for the 3 oxygen atoms = 100 g/mole. The Calcium is 40 percent of the molecular weight of CaCO3. You'll notice that 206 x 0.4 is equal to 82.4. I don't know Beeralchemy, but I'm assuming they want the actual Ca content, 82.4 ppm.
From the total hardness quoted, the Mg content is 8.2 ppm.
That is an odd way of reporting the Alkalinity, I'm not sure if they are saying it is the actual HCO3 content or if its the alkalinity expressed as CaCO3 or HCO3. I've never seen it expressed as HCO3, so that is probably out. But I have seen HCO3 content quoted and that can be converted to an alkalinity value. If the full water report parameters were provided, I could probably decipher.