200000m = km, 500000cm = m, 0.0035mm = m, 0.005M = km, 0.007 μ M = m, 0.00056m = nm, calculated by scientific counting method!

200000m=2×10^2 km,500000cm= 5×10^3m,0.0035mm=3.5×10^(-6) m,
0.005m= 5×10^(-6)km,0.007μm=7×10^(-9) m,0.00056m= 5.6×10^5nm

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