数字上的数学函数分为Java中的链接列表

I have two large numbers, say 123,456,789 and 987,654,321 that are each broken up into segments of three into Linked List nodes (as ints), ][123] [456] [789]] and [[987] [654] [321]] and I need to perform math functions on them (add, subtract, multiply, divide).I have two large numbers, say 123,456,789 and 9