Looks to me like they used, for the range "m -- n", column d:
ceiling (n * d)
(The function "ceiling" means "round up all fractions".)
So for example, HP 64, column 0.40 falls into the 64--66 range, and 66*0.4 = 26.4, which gets rounded up to 27. Personally I'd say the table was "wrong" in such cases (this guy is getting a free hitpoint, but are _you_ going to argue with him about it?), but if you want to stick to it, I think that's how they arrived at it.
Hope this helps,
Alex.
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