PI = 3.14159265358979
Square (2) = 1.414213562
Golden ratio = 1.618033988
One year = 365.2422 days
1.For a finite decimal, divide the number after the decimal point by 10 (one digit). 100 (two digits). 1000 (three digits), etc.
2, if it is an infinite loop decimal, then divide the number of loops by 9.99.999 (ibid.)
3.If it is a mixed-loop fraction, the number of cycles that are not in the two-digit case is divided by 990, two digits are 9900, and the value of the non-recurring fraction is multiplied by 990 or 9900.
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