If it helps someone who cares? For me I don’t know that it was so much the math (yes, I’m American, that’s the proper way to say it where I live), but that I was in a panic and didn’t even notice that my health bar had changed. For some reason I was checking my buffs to see if there was a new one with some number, but managed to tunnel vision right over my health. Also, I think I was confused by the way the boss phrases things. For example, doesn’t it say things like “divide by 3”? Again, it’s entirely possible I just misread or just wasn’t looking in the right place when I was feeling rushed/panicked, but if I had seen something like “divisible by 3” I would have found it much less confusing and would have known what to do, assuming I solved my issue of failing to even realize what number I was starting with earlier.