(- 3 9 5 4 15 July 8, 2019 16 32 64 128 9 3 5 plus 6 4 15 9 5 x 4 3 12 15 3 4 x 5 9 x 8 15 3 4 times 5 9 times 8 15 9 chia 3 5 x 4 15 5 + 9 = 14
