This is a question about the greatest common multiple. The greatest common multiple of 12 and 8 is 4.

The answer is:

1, the longest side of a square is 4 cm.

2, a * * * can be cut into six such squares.

12*8=96 (square centimeter), 4*4= 16 (square centimeter), 96/ 16=6 (pieces)

Come on!