Convert measurements within a system and use unit reasoning to choose the correct scale.
Convert to a smaller unit
Problem
Convert \(3~\text{feet}\) to inches.
Big Picture
What this problem is really about
Use an equality between the units as a conversion factor equal to one, placing the original unit in the denominator so it cancels. Because the target unit is smaller, multiply by the number of smaller units contained in each larger unit. The final numerical measure should grow while the physical length stays unchanged.
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