155687

From the multiplication file, we deduced that:

Semi-Circle=8, Square=2, Oval=4, Rectangle=3, Green Star=9, Circle=12, Orange Triangle=0, Diamond=1, Hexagon=10, Green Triangle=6 and Purple Star=5. If we follow this code, we can convert the table to:

3 x 4 = 12 2 x 4 = 8
3 x 3 = 9 2 x 2 = 4
6 x 2 = 12 0 x 8 = 0
2 x 5 = 10 1 x 10= 10
2 x 0 = 0 3 x 2 = 6
2 x 2 x 2 = 8 3 x 1 = 3

For extension Question 1,

Circle=4, Square=2, Doughnut=8, Diamond=5 and Star=7. Therefore,
142857
3 x
-----------
428571

For extension Question 2,

Square=8, Circle=5, Diamond=7, Star=1 and Doughnut=1. Therefore,
285714
3 x
-----------
857142