Those LLMs can’t handle numbers, they have zero concept of what a number is. They can pull some definitions, they can sorta get very basic arithmetic to work in a limited domain based on syntax rules, but it will mess up most calculations. ChatGPT tries to work around it by recognizing the prompt is related to math, passing it to a more normal Wolfram-Alpha style algorithm, and then using the language model to format the reply into something more appealing, but even this approach often fails because if the AI gets confused for any reason it will feed moronic data to the maths algorithm.