Evaluate a decimal ratio precisely: Compute (.24 × .35) / (.14 × .15 × .02) and select the exact value.

Difficulty: Easy

Correct Answer: 200

Explanation:


Introduction / Context:
Division of decimal products is easiest when we remove decimals by powers of 10 or compute numerically with careful place-value handling. This example keeps numbers small and clean, ideal for mental or quick written calculation.


Given Data / Assumptions:

  • Numerator: 0.24 × 0.35
  • Denominator: 0.14 × 0.15 × 0.02


Concept / Approach:
Compute numerator and denominator separately, then divide. Alternatively, scale all terms by a sufficient power of 10 to clear decimals and simplify before division (the ratio remains unchanged).


Step-by-Step Solution:

Numerator: 0.24 × 0.35 = 0.084Denominator: 0.14 × 0.15 = 0.021; then 0.021 × 0.02 = 0.00042Quotient: 0.084 / 0.00042 = 200


Verification / Alternative check:

Scale by 10,000: (2400 × 3500) / (1400 × 1500 × 200) simplifies by cancellations to 200.


Why Other Options Are Wrong:

  • 2, 20, 2000: Each corresponds to a misplacement of decimal points or a missed zero during scaling.


Common Pitfalls:

  • Losing track of total decimal places when multiplying three small decimals.
  • Not simplifying common factors after clearing decimals.


Final Answer:

200

Discussion & Comments

No comments yet. Be the first to comment!
Join Discussion