4 2 8 x 9 7 3 July 8, 2019 16 32 64 128 8 4 3x 9 )- 2 x 7 4 9 x 3 8 x 2 7 x 1 6 4 10 x 3 9 x 2 8 x 1 7 4 3 x 9 7 27 5 x 8 2 3 2 4 7 x 9 8 0125 4 8-8 9= 4 - 2 8/9