Editing 7 (section)

====Decimal calculations====

{{num|999,999}} divided by 7 is exactly {{num|142,857}}. Therefore, when a [[vulgar fraction]] with 7 in the [[denominator]] is converted to a [[decimal]] expansion, the result has the same six-[[numerical digit|digit]] repeating sequence after the decimal point, but the sequence can start with any of those six digits.<ref>Bryan Bunch, ''The Kingdom of Infinite Number''. New York: W. H. Freeman & Company (2000): 82</ref> In [[decimal]] representation, the [[Multiplicative inverse|reciprocal]] of 7 repeats six [[Numerical digit|digits]] (as 0.{{overline|142857}}),<ref>{{Cite book |last=Wells |first=D. |url=https://archive.org/details/penguindictionar0000well_f3y1/mode/2up |title=The Penguin Dictionary of Curious and Interesting Numbers |publisher=[[Penguin Books]] |year=1987 |isbn=0-14-008029-5 |location=London |pages=171–174 |oclc=39262447 |url-access=registration |s2cid=118329153}}</ref><ref>{{Cite OEIS|A060283|Periodic part of decimal expansion of reciprocal of n-th prime (leading 0's moved to end).|access-date=2024-04-02}}</ref> whose sum when [[Cyclic number#Relation to repeating decimals|cycling]] back to [[1]] is equal to 28.