yes..
.1 = .10.. which actaully equals .1000000000
the amout of zeros after the 1doesnt mater when dealing with numbers (not hobby related, its jsut how the base10 numbering system works..
so yes, the .4 is the same as .40
adn for the multiply by 2 things...
you need to multiply the results times 2, not your reading on the dropper..
you you dont do .40 x 2 =.80
you do .40 = 300 x 2 = 600
