Matching Pairs SUMA/RESTA ENTEROS IIOnline version Opera by Alejandro García Doblado 1 -6 - (-5)= 2 9 - (-5)= 3 -2 + (-4) 4 -18-2= 5 9-(+15)= 6 7-(-4)= 7 -18+7= 8 -14-25= 9 8 + (-7)= 14 6 -20 -39 -11 -1 -6 11 1