The Thai language has its own set of numerals, although the standard Arabic/Western numerals are much more commonly encountered. You may come across the Thai numerals in government and official documents, legal documents, religious texts, page numbers of textbooks or generally anything related to Thai tradition or history. When doing mathematics, Thai students will typically use the Arabic numerals for doing calculations but will write the answer in Thai numerals. A common use for the Thai numerals that you're likely to see is in double pricing situations, where a price for Thais is written in Thai numerals whereas the more expensive price for foreigners is written in Arabic numerals. If you can learn the Thai numerals, your chances of being able to only pay the Thai price are much improved!