7x 3 5x 15 July 8, 2019 16 32 64 128 5x 3 7x 2 15x 21 0 8x 3 5 7x )= 5x 15 7x 15 3 5x )- 8 5x 3 7x 2 15x 21 5x 15 7x 3 180 5 x 7 = 35
