You do not. A cubic metre is a measure of volume, whereas a metre is a measure of distance or displacement. The two measure different things and, according to the basic principles of dimensional analysis, conversion from one to the other is not valid.
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By multiplying the number in m3 by 1000.
"m cube" is m3.
m3*m5 = m3+5 = m8
Multiply by 1000000.
You cannot convert m2 to m3 without a third measurement as a cubic measurement is width plus length pus depth.