Solution
$$30 \times 3 \times 0.3 \times 0.03 \times 0.003$$
= $$30 \times 3 \times(\frac {3}{10}) \times(\frac{3}{100}) \times(\frac{3}{1000})$$
= $$\frac{3\times 3\times 3\times 3\times 3}{100000}$$
= $$\frac{243}{100000}$$
= 0.00243
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