Question 1

How many inches in a foot?

Accepted Answer

1 foot = 12 inches exactly. The foot is a fundamental imperial unit, with 3 feet = 1 yard and 5,280 feet = 1 mile.

Question 2

Why are there 12 inches in a foot?

Accepted Answer

The 12-inch foot likely came from its divisibility (factors: 1,2,3,4,6,12), making mental math easier for fractional measurements.

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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