Not quite so simple Framer........
I'm with Framer, he talked of a GROSS error check, not a nit-picking knot or two here and there, think of the big picture.
Slightly off thread I know, but when learning to navigate I was told to stop trying to do a maths exam in a rattling steel cabinet and pretend I was sat on the tail driving the thing over a map of the World, but it is the same thing with take off performance, if you are going a long way you will be heavy, EPR numbers and V1/V2 numbers will be BIGGER. If they're not, stop and ask why. Might be a perfectly good reason, but might not, also.
I believe the SQ incident out of AKL was being flown by a guy recently off the A 340, so the lower numbers that they had mistakenly derived, seemed OK to him, had he been more familiar with the 747 he wouldn't have accepted them. The Big Picture. Head out of the computer. ( I also vowed I'd never fly without a Flight Engineer, too - but that's another story !! )