the number 1 in Mandarin Chinese is usually pronounced "yi" which can be mistaken for the number 7 ("qi"). so in certain contexts, e.g. reading out a phone numb

the number 1 in Mandarin Chinese is usually pronounced "yi" which can be mistaken for the number 7 ("qi"). so in certain contexts, e.g. reading out a phone number, it would be pronounced "yao" instead.