In the Numbers concept (and by extension, the Currency Exchange exercise instructions), the “Arithmetic” section seems to have a typo (emphasis mine):
Python fully supports arithmetic between
intsandfloats. It will convert narrower numbers to match their less narrow counterparts when used with the binary arithmetic operators (+,-,*,/,//, and%). When division with/,//returns the quotient and%returns the remainder.
I’m not sure if it was supposed to be “When dividing with /” or something else, but the current sentence is rather confusing and not grammatical.