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Why is it wrong to write India's area as (32.8) million sq km instead of (3.28) million sq km?

Answer and explanation

Correct answer: Changing decimal place makes the area ten times wrong

The direct answer is A: changing 3.28 to 32.8 makes the stated area ten times too large. Compare the numbers carefully: 3.28 multiplied by 10 equals 32.8, so 32.8 million sq km is ten times 3.28 million sq km. The decimal has moved one place to the right, increasing the value by a factor of ten. India’s commonly stated area is about 3.28 million square kilometres, not 32.8 million. Option A is correct because it identifies the decimal-place error and its effect. Option B is wrong because the two numbers are not equal. Option C is wrong because area is measured in square kilometres, and the issue is the incorrect number as well as the unit. Option D is wrong because India’s area has been measured and reported. Exam cue: moving a decimal one place right multiplies a number by ten.

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Area ValueDecimal PlaceError

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