Matching Pairs calculo mental Online version el mejor creador by David NM 1 30+34 x 2+21+2/2 2 20 x 3+1-2+3-4 3 14+123-15 4 73+23-45+12-4 5 20+32+41+7 6 9+123+7-131 7 200 x 10-300+250-1000+50-275+25-725+15-40 59 8 58 100 120 0 122