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What is the decimal form of 7/40?

Answer and explanation

Correct answer: 0.175

The governing concept is expressing a fraction as a terminating decimal. To make the denominator a power of ten, multiply 40 by 25, giving 1000. The numerator must also be multiplied by 25: 7/40 = (7 × 25)/(40 × 25) = 175/1000 = 0.175. Therefore option A is correct. The result is sensible because 7/40 is less than 1, so its decimal must be less than 1; this rules out 1.75 immediately. The value 0.075 equals 3/40, so it uses the wrong numerator. The value 0.740 is not the result of the fraction calculation and equals 0.74. Since 40 = 2³ × 5, its denominator contains no prime factors other than 2 and 5; consequently the decimal expansion terminates after a finite number of places. Both denominator scaling and ordinary division verify 0.175.

Related tags

Decimal RepresentationFraction ConversionTerminating DecimalNumber SystemsMathematicsClass 9 Mcq

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