1/7 is the fraction of one seventh. If you had a cake (ignoring any crumbs) and divided it equally between 7 people, each would get one seventh of it.
As a vulgar fraction, it is also a rational number.
As a decimal, it repeats the digits 142857 infinitely (1/7 = 0.14285714...), but it would be usual to approximate to 2 or 3 decimal places: 1/7 ≈ 0.143
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