Respuesta:
7 5
_ + _
13 10
multiplicas
7×10
10×13
13×5
70+65
----------
130
135
-----
simplificas y queda
27
---
26
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Respuesta:
7 5
_ + _
13 10
multiplicas
7×10
10×13
13×5
70+65
----------
130
135
-----
130
simplificas y queda
27
---
26