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Inches to feet, at 12 inches to the foot. The conversion itself is trivial; the part that trips people up is that the answer usually wants expressing as feet *and* inches rather than as a decimal, because 5.83 feet means nothing to anyone while 5 ft 10 in means something to everyone.
Frequently asked questions
How do I express the result as feet and inches?
The whole-number part of the answer is your feet; multiply what's left by 12 for the inches. 70 inches ÷ 12 = 5.833, so 5 feet, and 0.833 × 12 = 10 inches — 5 ft 10 in.
Why do construction plans use decimal feet?
Because arithmetic on feet-and-inches is painful — adding 3 ft 7 in to 4 ft 9 in requires carrying at 12. US construction and surveying therefore work in decimal feet (and often tenths and hundredths), converting to feet-and-inches only at the point someone has to read a tape measure.