575
1) 1/4 * 2/3 = 1/2 * 1/3 = 1/6
2) 4/9 * 1/2 = 2/9 * 1/1 = 2/9
3) 2/3 * 3/8 = 1/1 * 1/4 = 1/4
4) 5/12 * 8/9 = 5/3 * 2/9 = 10/27
576
1) 3 1/4 * 8 = 13/4 * 8/1 = 13/1 * 2/1 = 26
2) 5 1/3 * 6 = 16/3 * 6/1 = 16/1 * 2/1 = 32
3) 4 * 1 1/2 = 4/1 * 3/2 = 2/1 * 3/1 = 6
4) 7 * 1 1/3 = 7/1 * 4/3 = 28/3 = 9 1/3