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What is the value of (12.006 − 7.21975)?

Answer and explanation

Correct answer: 4.78625

The governing idea is place-value alignment in decimal subtraction. Write 12.006 as 12.00600 by adding two zeros to the right; this does not change its value. Now subtract: 12.00600 − 7.21975. Subtracting in columns, the result is 4.78625. A quick check is that 7.21975 + 4.78625 = 12.00600, confirming the calculation. Thus option A is correct. Option B differs by 0.01000, while option C is close to the reversed or incorrectly borrowed computation and option D results from an error in one of the decimal columns.

Related tags

Number-SystemsDecimal-RepresentationDecimal-SubtractionDecimal RepresentationNumber SystemsMathematicsClass 9 Mcq

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