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Which relation is correct among 0.3125, 5/16, and 0.31̅2?

Answer and explanation

Correct answer: 0.3125 = 5/16 > 0.31̅2

The governing concept is converting equivalent forms before comparing numbers. First, 5/16 can be converted to a decimal by dividing 5 by 16, giving 0.3125. The notation 0.31̅2 means that only the digit 2 repeats: 0.3122222..., not 0.3125. Compare the latter with 0.3125 digit by digit: both begin 0.312, but at the fourth decimal place, 2 is less than 5. Thus 0.31̅2 < 0.3125, while 0.3125 = 5/16. Therefore option A is correct. Option C reverses the comparison, option B incorrectly equates the repeating decimal with 5/16, and option D ignores the different fourth and later digits.

Related tags

Decimal RepresentationRecurring DecimalsComparison Of NumbersNumber SystemsMathematicsClass 9 Mcq

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