15 + 1 - 16, 12 + 5 - 17, 19 + 1 - 20, 10 + 3 - 13, 18 - 9 - 9, 17 - 3 - 14, 10 - 3 - 7, 20 - 9 - 11, 20 - 1 - 19, 10 + 2 - 12, 10 - 2 - 8, 10 - 8 - 18, 10 - 5 - 5, 10 + 5 - 15, 10 - 0 - 10,

Cálculo Mental: SUMAS Y RESTAS

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