15 4/9- 4 4/9 * 3 3/8
4 4/9 x 3 3/8= 40/9x27/8=15 15 4/9-15=4/9
15 4/9-4 4/9*3 3/8=15 4/9-40/9*27/8=15 4/9-15=4/9