Threaded Screw

A 1\;7/8-inch screw is threaded for 2/3 of its length. If the screw has 16 threads, how far will it go into a piece of wood with each complete turn?
Source: NCTM Mathematics Teacher 2008

SOLUTION
Length of threaded part
\dfrac{15}{8}\times\dfrac{2}{3}=\dfrac{5}{4}
Depth of penetration of each complete turn of thread
\dfrac{5}{4}\div 16=\dfrac{5}{64} in

Answer: 5/64 in.

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About mvtrinh

Retired high school math teacher.
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