X 3 2x 5 =- 7 15 July 8, 2019 16 32 64 128 X 2 x 3 x 5 2x 15 7 X 3 2x 4 5 2x 15 6x 7 30 7 21 x 3 )= 13 15 2x 5 5 x 7 = 35
