None. And there are no square metres, either.
A square metre is a measure of area in 2-dimensional space whereas a cubic metre is a measure of volume in 3-dimensional space. The two measure different things and, according to the basic rules of dimensional analysis, conversion from one to the other is not valid.
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A cube with sides that measure 1 meter, will give you:100 cm x 100 cm x 100 cmwhich equals:1,000,000 cm3
(0.5 m3) x (100 cm per meter)3 = 500,000 cm3
one meter is 100 centermeters 1m3 is 1,000,000cm3
Each smaller cube should have edges of length 10*cuberoot(10) = 21.5543 centimetres.
100 centimeters equal 1 meter.