A = 5/10 + 2/5
A = 5/10 + (2x2)/(2x5)
A = 5/10 + 4/10
A = 9/10
B = 2/6 + 1/3
B = 2/(2x3) + 1/3
B = 1/3 + 1/3
B = 2/3
C = 1/12 + 1/6
C = 1/12 + (1x2)/(6x2)
C = 1/12 + 2/12
C = 3/12
C = (1x3)/(4x3)
C = 1/4
D = 2/7 + 1/14
D = (2x2)/(7x2) + 1/14
D = 4/14 + 1/14
D = 5/14
E = 1/6 + 2/7
E = (1x7)/(6x7) + (2x6)/(7x6)
E = 7/42 + 12/42
E = 19/42
F = 2/3 - 1/6
F = (2x2)/(3x2) - 1/6
F = 4/6 - 1/6
F = 3/6
F = (1x3)/(2x3)
F = 1/2
G = 3/8 - 1/4
G = 3/8 - (1x2)/(4x2)
G = 3/8 - 2/8
G = 1/8
H = 4/16 - 3/4
H = (1x4)/(4x4) - 3/4
H = 1/4 - 3/4
H = (-2/4)
H = (-1/2)
I = 4/11 - 7/5
I = (4x5)/(11x5) - (7x11)/(5x11)
I = 20/55 - 77/55
I = (-57/55)
J = 13/12 - 9/4
J = 13/12 - (9x3)/(4x3)
J = 13/12 - 27/12
J = (-14/12)
J = (-2x7)/(2x6)
J = (-7/6)