I know this might sound tacky, but I would say use long division. It's fast and easy. I think your first reply was hinting at it, because the method is similar. Just add 0's.
for example:
....._0.091_
16.4)1.50
........148
......------
...........20
...........16
..........----
............40etc, etc
Ok, so first I just write it out, then when you get good at it you can do it in your head.
_________
denominator) Numerator
Then place the decimal point directly above where it is listed under the "bracket."
ask yourself, does 16.4 go into 1 - no (add a 0 above the line at that point)
15 - no (add a 0)
150 - Yes
When it's a big number like this I use multiples of ten - so I would get 164 [too much, so drop one 16.4 so it goes into 150 9x = ~148]
write the 148 below the line. Then the 9 above it.
Now subtract 148 from 150 = 2
Then ask yourself does 16.4 go into 2? No so add a 0
does 16.4 go into 20? Yes 1 time (put the 1 above the line).
You can keep doing it to get as accurate as you want. For the mcat you can usually get away with 1 or sig figs.
It looks like a lot, but it is sooo easy and ensures that you don't mess up an easy calculation. Once you get it down you can knock out what would look like a pretty hairy piece of division in ~10 seconds or less.
