Calculo mentalOnline version Calcular es divertido by Mayra García Mármol 1 Total a 9 b 7 c 8 2 Total a 12 b 9 c 13 3 Total a 13 b 12 c 14 4 Total a 15 b 11 c 12 5 Total a 13 b 16 c 12 6 Total a 15 b 12 c 14 7 Total a 18 b 16 c 17 8 Total a 16 b 11 c 15 9 Total a 15 b 17 c 14 d 12 10 Total a 13 b 11 c 17 d 16 11 Total a 13 b 15 c 23 d 26 12 Total a 13 b 14 c 17 d 11 13 Total a 19 b 14 c 18 d 12 14 Total a 15 b 11 c 14 d 16