$0.4 \times 0.9 =___$

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Solution

When we remove a decimal from a given number then the number of zeros is added to the denominator
$= 0.4 \times 0.9 = \frac{4}{10} \times \frac{9}{10} = \frac{36}{100} = 0.36$
Hence, $0.4 \times 0.9 = 0.36$

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