Question 1

How many km in a mile?

Accepted Answer

1 mile = 1.60934 km. Quick estimate: multiply miles by 1.6 or add 60% to the miles value.

Question 2

How do I convert miles to km quickly?

Accepted Answer

Multiply by 1.6 or use the Fibonacci trick: consecutive Fibonacci numbers approximate miles-to-km (5 mi ≈ 8 km, 8 mi ≈ 13 km).

Question 3

Is this conversion factor exact?

Accepted Answer

Metric-to-metric conversions are exact (1 km = 1000 m). Imperial-to-metric factors like 1 inch = 2.54 cm are exact by international agreement.

Question 4

Why do some countries use different units?

Accepted Answer

Historical reasons - the metric system spread from France after 1795. The US, UK, and a few others retained older systems. Science uses metric worldwide.

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