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