Matching Pairs mosaico calculoOnline version mosaico de cálculo mental by Carlos San Mar 1 15 + 8 2 48 ÷ 4 3 41 + 15 4 33 + 7 5 33 - 11 6 25 x 3 7 36 ÷ 4 8 10 - 6 9 30 - 11 10 5 x 5 11 19 + 1 12 15 - 9