[ Arithmetic. Mental calculation, etc.] [ Volume of a parallelepiped ]

A cube with a side of 1 m was sawn into cubes with a side of 1 cm and laid in a row (in a straight line). What length did the row turn out to be

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We get $100 \times 100 \times 100=1000000$ (cm) or 10000 m = 10 km.