5) 2*5
over which equals 10/40 or 1/4
5*8
6)8*3=24
15*10=150 answer is 24/150
7)2*12=24
9*13=117 answer 8/39
8)7*12=84
8*1=8 answer 8 and 1/2 or 84/8
9)4*5=20
12*1=12 answer 1and 2/3 or 20/12
10) 4*4=16
9*9=81 answer 16/81
11)3*7=21
14*9=126 answer 1/6
12)8*24=192
9*11=99 answer 1 and 31/33 or 192/99