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b) 3/4 + 5/12= 9/12+5/12=14/12= 1 2/12= 1 1/6
c) 8/9 - 5/18= 16/18-5/18=11/18
d) 1/3 + 3/4= 4/12+9/12=13/12=1 1/12
e) 3/5 - 1/2= 6/10-5/10=1/10
f) 1 1/2 - 1/3= 1 3/6-2/6= 1 1/6
g) 1 1/2 + 3/8=1 4/8+3/8=1 7/8
h) 1 1/3 - 2/9=1 3/9-2/9= 1 1/9
i) 2 3/5 - 7/10= 2 6/10-7/10 = 1 16/10 - 7/10= 1 9/10
j) 5/6 - 1/4=10/12 - 3/12= 7/12
k) 1 1/6 - 7/9 1 3/18-14/18= 21/18-14/18= 7/18
l) 2 3/8 - 1 5/6 = 2 9/24-1 20/24=1 33/24-1 20/24= 13/24