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Calculo mental Sumar 9 a un número de 2 cifras 001 Colegio Marista San José Luis Gutiérrez Martín - lgm@maristasleon.com
45
53
39
12
48
85
25
41
63
47
49
65
31
15
69
51
24
26
31
37
91
26
23
18
46
62

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Sumar 9 2 cifras