The correct way to spell 60 is s-i-x-t-y. It is important to note that the word is spelled with a "y" at the end and not an "ie". This is a common spelling mistake, as many people add the "ie" at the end by mistake. It is also important to differentiate between the pronunciation of the word and the spelling. Some people may confuse the word "sixty" with "sixteen" due to their similar sound. However, "sixty" refers to the number 60, while "sixteen" refers to the number 16. To avoid confusion, it is important to spell out numbers correctly, especially when writing formal documents or communications.