If \(\dfrac{37}{2^4\cdot 5^8}\) is written as \(\dfrac{N}{10^8}\), what is \(N\)?

592

Reason: \(10^8=2^8\cdot5^8\). The given denominator has \(5^8\) but only \(2^4\). To convert the denominator to \(2^8\cdot5^8\) multiply numerator and denominator by \(2^4=16\). Thus \(N=37\times16=592\). About distractors: C (1184) corresponds to multiplying by 32 (\(2^5\)) mistakenly; A (296) is half of the correct value (\(37\times8\)) and often comes from dividing instead of multiplying; D (23125) would result from incorrectly multiplying by \(5^4=625\) (\(37\times625\)). Exam tip: factorise \(10^n\) as \(2^n\cdot5^n\) and balance the powers of 2 and 5 to find the factor for the numerator quickly.

This is a Class 10 Mathematics question. Chapter: Real Numbers. Topic: Decimal expansion of rational numbers.