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Among 0.875, 0.857, 0.8705, and 0.87, which is the greatest number?

Answer and explanation

Correct answer: 0.875

The governing concept is comparison of decimal place values. Express all numbers to four decimal places: 0.8750, 0.8570, 0.8705, and 0.8700. The tenths digit is 8 in every number, so compare the hundredths digits. The value 0.8570 has 5 and is immediately smaller than the others, which have 7. Among the remaining values, compare the thousandths digits: 0.8750 has 5, whereas 0.8705 and 0.8700 have 0. Therefore 0.8750 is the greatest, so option A is correct. Notice that 0.87 is exactly 0.8700; trailing zeros do not change value. Option C is close but remains smaller than 0.875.

Related tags

Decimal RepresentationComparing DecimalsPlace ValueNumber SystemsMathematicsClass 9 Mcq

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