Quite easy for a UK resident but a bit misleading too as Britain uses many of the supposed 'US' spellings dependent on exactly which meaning is intended. The US spelling of 'curb' is used in Britain to mean 'restrain' whereas 'kerb' means the edge of the road. 'Story' is used in Britain to describe a tale or narrative, whereas 'storey' is used for the floor of a building. 'Prize' is definitely used to describe something someone wins whereas 'prise' is used to describe what you would do to open something with difficulty. 'Whilst' is an archaic term, now rarely used in the UK, the normal spelling of the word to describe the passing of time is 'while', just as in the US. Similarly 'check' and 'cheque' are both used and mean different things in the UK. The same is true for 'racket' and racquet, the first means an unpleasant noise and the second what you use to play tennis. I guess the different spellings in the UK help to differentiate the meanings, rather than relying on context alone.