Correcto: 6 + 6 : 12, 4 + 6 : 10, 10 - 8 : 2, 15 - 6 : 9, 17 + 3 : 20, 18 + 4 : 22, 19 - 3 : 16, Incorrecto: 6 + 6 : 14, 4 + 6 : 11, 10 - 8 : 4, 15 - 6 : 7, 17 + 3 : 19, 18 + 4 : 24, 19 - 3 : 17,

Sumas y Restas (calculo mental)

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