Class size information for math PhD programs can be challenging to find, but it appears that programs like those at UCLA typically admit 30-40 new graduate students annually, combining both pure and applied math. This number can fluctuate based on various factors, including undergraduate interest and faculty teaching assignments. For example, the presence of renowned faculty can significantly impact enrollment in specific courses. While some universities provide admissions data on their websites, it may require thorough searching to find accurate figures. To estimate class sizes, one can divide the total number of current graduate students by the average years to graduation, often approximated at 4.5 years. Overall, the trend in admissions numbers has been influenced by economic conditions, with some fluctuations observed in recent years.