Young Harry liked numbers, he liked using numbers and working out the value of things. When he found out that he was a wizard and had a big pile of gold... well, he had something new to calculate. oneshot, complete, don't own.

Vague spoilers for PS-HBP. One-shot. James Potter observes as Harry arrives to an alternate dimension where his parents are alive and Neville is the Boy-Who-Lived. Trying to teach old cliches new tricks, here.