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