12 1 4 x 5 3 7 July 8, 2019 16 32 64 128 1 12 4 3x 5 3 x 7 4 1 4 )( x 12 5 2 3 x 7 1 3 x 3 7x 12 5 4 1 16 x 4 5 x 12 3 8 x 7 12 x 5 1/4 12 4/5 x 3 1/8 12 ×1=12
