add in the indicated base
498
12
+ 418
12
________
base 10: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ...
base 12: 1 2 3 4 5 6 7 8 9 A B 10 11 12 13 14 ..
so in base 12
8+8 = 14 , carry 1
9+2 = B
4+4 = 8
49812 + 41812 = 8B412