Construct addition and multiplication tables for base 4

Answer 1

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