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j = 3/13 x 11/2 = 33/26 

k = 42/24 x 15/35
k = 21/12 x 3/7
k = 63/84 = 3/4

l = 26/21 x 63/65
l = 1638/1365 = 6/5

m = 6 x 2/5 x 3/7
m = 36/35

n = 14/6 - 1/3 x 5/2
n = 14/6 - 5/6 = 9/6 = 3/2

p = ( 1 + 1/4) x 4/10
p = ( 4/4 + 1/4) x 4/10
p = 5/4 x 4/10 = 20/40 = 1/2

r = 3/8 x 1/2 - 1/16
r = 3/16 - 1/16 = 2/16 = 1/8