Construct addition and multiplication tables for base 4
addition:
**0 1 2 3
0 0 1 2 3
1 1 2 3 10
2 2 3 10 11
3 3 10 11 12
e.g. 2 + 3 = 11
multiplication:
** 1 2 3 <---- I skipped the 0, since 0*anything in any base = 0
1 1 2 3
2 2 10 12
3 3 12 21