CÁLCULO MENTAL 6º: 1.1 Sumar 1.001, 2.001,..., 999, 1.999...

CÁLCULO MENTAL 6º: 1.1 Sumar 1.001, 2.001,..., 999, 1.999...
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Instrucciones del autor

Sumar 1.001, 2.001,..., 999, 1.999..., a números de 4 cifras.