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What is obtained by multiplying 0.00390625 by 1000000?

Answer and explanation

Correct answer: 3906.25

The governing concept is place-value movement when multiplying a decimal by a power of 10. Since 1,000,000 = 10⁶, multiplication moves the decimal point six places to the right. Starting with 0.00390625, the shifts are 0.0390625, 0.390625, 3.90625, 39.0625, 390.625, and finally 3906.25. Therefore option C is correct. The same result can be checked by writing 0.00390625 = 390625/100000000 and multiplying by 1000000, which gives 3906.25. Option A corresponds to moving the point four places, option B to five places, and option D to seven places. Counting all six zeros prevents these place-value errors.

Related tags

Decimal RepresentationDecimal MultiplicationPlace ValueNumber SystemsMathematicsClass 9 Mcq

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