Часть от целого находится умножением.
184 * 1/2 = 184: 2 = 92
12/5 * 500 = 500:5*12 = 100*12 = 1200
3/2 * 5/8 = (3*5)/(2*8) = 15/16
7/5 * 2/3 = 14/15
8 * 5 1/3 = 8*16/3 = 128/3 = 42 2/3
1 1/4 * 5/8 = 5/4 * 5/8 = 25/32
1 1/3 * 5 1/3 = 4/3 * 16/3 = 7 1/9
5/9 * 13 1/2 = 5/9 * 27/2 = 135/18 = 7 1/2
3 1/2 * 8/14 = 7/2 *4/7 = 2
25/26 * 39 * 19/15 = 37 1/2 * 1915 = 47 1/2