30 + 8 - 38, 5+4+2 - 11, 50 + 9 - 59, 24 - 4 - 20, 48 - 8 - 40, 48 - 40 - 8, 20+8 - 28, 31-1 - 30,

CÁLCULO MENTAL: Alumnas segundo grado

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