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A fraction is a ratio of two integers. Fractions are traditionally
written “2/3” but Calc uses the notation ‘`2:3`’. (The `/` key
performs RPN division; the following two sequences push the number
‘`2:3`’ on the stack: `2 : 3 <RET>`, or `2 <RET> 3 /`
assuming Fraction mode has been enabled.)
When the Calculator produces a fractional result it always reduces it to
simplest form, which may in fact be an integer.

Fractions may also be entered in a three-part form, where ‘`2:3:4`’
represents two-and-three-quarters. See Fraction Formats, for fraction
display formats.

Non-decimal fractions are entered and displayed as
‘` radix#num:denom`’ (or in the analogous three-part
form). The numerator and denominator always use the same radix.