Matching Pairs Cálculo mentalOnline version Hacer cálculo mental by JESÚS SOLDEVILA ALBERT 1 5 x 5 - 13 2 6 x 4 - 15 3 6 x 8 - 13 4 12 x 5 5 9 x 7 + 12 6 6 x 3 + 19 7 5 x 3 + 16 8 9 x 8 + 17 9 6 x 6 + 19 10 8 x 2 + 18 11 8 x 8 + 14 12 5 x 8 - 16 13 5 x 7 - 14 14 7 x 4 - 12 31 78 9 21 24 16 55 89 75 34 35 37 60 12