1) -1/4 + 3/5=7/20
2) 9/11 + (-2/5)=23/55
3) -20/21 + 3/7= -11/21
4) 75/12 + (-3 7/24)=71/24= 2 23/24
5) -6 11/12 + ( -8 13/18 )= -15 23/36
6) -5 12/35 + 10= 163/35=4 23/35
7) -3 1/12 + 1/6= -35/12= -2 11/12
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Answers & Comments
1) -1/4 + 3/5=7/20
2) 9/11 + (-2/5)=23/55
3) -20/21 + 3/7= -11/21
4) 75/12 + (-3 7/24)=71/24= 2 23/24
5) -6 11/12 + ( -8 13/18 )= -15 23/36
6) -5 12/35 + 10= 163/35=4 23/35
7) -3 1/12 + 1/6= -35/12= -2 11/12