Sumar: pestañas

captura-de-pantalla-2017-02-11-18-57-13

Practica:

13 + 24 =

26 + 24 =

37 + 23 =

46 + 54 =

73 + 21 =

85 + 11 =

56 + 24 =

42 + 28 =

13 + 67 =

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