https://mathweb.ru/allsystem.html?id=170385

Сложить 10000000000000000000000000000000000(6) и 1000000000000000000000000000000000000000000000000000000000000000000(6) = 1000000000000000000000000000000010000000000000000000000000000000000 Столбиком

Введите два числа и укажите их основание системы счиления:
+10000000000000000000000000000000000
1000000000000000000000000000000000000000000000000000000000000000000
1000000000000000000000000000000010000000000000000000000000000000000
Ответ: 100000000000000000000000000000000006 + 10000000000000000000000000000000000000000000000000000000000000000006 = 10000000000000000000000000000000100000000000000000000000000000000006