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