MATHEMATICALLY may (appropriately) be coded as 53897538213440.My Swiss-French friend lives in a CHALET (193478), and his name is the only one with the phone number correctly coded below. Which is his name?

The process of decoding words is much the same. Be sure to read each question carefully - a misread number can mean the difference between CORRECT and CONNECT! Also, pay attention to the helpful comments after each question. They will shed much-needed light onto how the codes are worked out.