They base their travel planning around a carefully calculated budget, and fit their destination accordingly. Mathematical travellers count every hour spent in travelling between destinations and like to chart out their carefully planned journey until every day of their trip is fully accounted for.
They can tell you how many steps you walked up to the top of Notre Dame Cathedral, how fast the Eurostar travels and the exact distance between St Pancras station and Garre de Nord. Perhaps, the more extreme number crunching traveller will have worked out how many passengers are housed in each carriage, then multiplied that by the number of carriages the Eurostar is made up of on this particular trip.
They will willingly calculate currency exchange rates, divide up bills at restaurants and keep track of travel budgets, all without using a calculator. No nasty credit legacies from over expenditure will eventuate with a number cruncher in charge of overseeing travel expenditure .
Whilst some number crunchers may only wish to travel to destinations where major mathematical theorums were developed, mostly a number cruncher can be a true asset as a travel companion, especially if mathematical processes, like division, subtraction, let alone basic addition are required along the way. If your travels involve foreign exchange rates, or you intend spending any money whatsoever whilst away, then you will find their obsession with numbers an absolute advantage, especially if number crunching is not your forte!