How do you do this problem Multiply. 1B7twelve x 29twelve

Answer 1

I would change it to base 10, do the multiplication , then convert back to base 12

1B7 = 12^2 + 1(12) + 7 = 286
29 = 2(12) + 9 = 33

289*33 = 9537

9537 = 5(12)^3 + 897
= 5(12)^3 + 6(12)^2 + 33
= 5(12)^3 + 6(12)^2 + 2(12) + 9
= 5629₁₂