Distance
1 in = 2.54 cm · 1 ft = 12 in · 1 m = 3.28 ft
What distance is and which units measure it
The relations among inch, foot, centimeter and meter
When to multiply and when to divide
Adding and subtracting mixed measures
10 mm = 1 cm
100 cm = 1 m
1,000 m = 1 km
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