1) (-9) +(-91)=-100
2)48+ (+21)=69
3)-27 + 73=46
4) +39 + (+39)=78
5) (-24) + (-24)=-48
6) (+45) + 0=45
7) -72 + 17=-55
8) 6+ (-94)=-88
9) (-12) + (+12)=0
10) 0 + (-2)=-2
11) +36 + (-3)=33
12) (+46)+(-46)=0
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Answers & Comments
1) (-9) +(-91)=-100
2)48+ (+21)=69
3)-27 + 73=46
4) +39 + (+39)=78
5) (-24) + (-24)=-48
6) (+45) + 0=45
7) -72 + 17=-55
8) 6+ (-94)=-88
9) (-12) + (+12)=0
10) 0 + (-2)=-2
11) +36 + (-3)=33
12) (+46)+(-46)=0