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