2π is about 6.38 (since π is about 3.14).
sqrt(29) is about 5.something, since 29 is between 25 and 36 and sqrt(25)=5 and sqrt(36)=6.
third root of 64 is 4, since 4^3 = 63.
So, the least is third root of 64,
then sqrt(29),
then 2π.
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