ramzes

Price and base are pretty straightforward, base is the whole unit - the currency we’re buying another with. If you think about it there’s two values to a rate, 1 and some number, .4016 or whatever. I just remember it as base is kind of like standard and will always be the same amt (1) while prices vary.
for cross rates just write out the currency’s and cancel out as necessary.
Aus/usd * usd/cad = Aus/cad (the usd’s cancel)