9 x 15 4x July 8, 2019 16 32 64 128 9x 9 4x 15 180 9x 9 4x 15 6x 9 9x 15 4x 3x 4x 9 15 x 3 5 1 9 6 4x 1 )= x 15 4x 15 9 x 8 9 x 8 = 9 x 15