The thing is doesn't the boss say when he goes in to Computation Mode to match numbers to required multiples... or something along the lines of that. Then a few seconds after he will ask you to provide either multiples, divisions or a prime number.

So if you have 3 HP and it asks you to divide by 3, you could go in to the 3 circle to increase to 6 HP or just stay where you are, as 3x1 is still a multiple. The only issue I had though was with the Prime numbers, it's not exactly something you use in day to day life.