Learn English – What do you call a fraction that cannot be written as a finite decimal

fractionsmathematicsnumbers

For example, the fraction ⅓ cannot be written, because it repeats infinitely (0.33333333… etc). Is there a particular word for numbers that cannot be written directly, but must be expressed as fractions?

Best Answer

Also Periodic decimal:

Richard Suchenwirth 2002-04-27 - Periodic decimal fractions are numbers where a sequence of digits behind the decimal point (the period) is endlessly repeated,

for example:

1/7 = 0.142857142857.. 1/3 = 0.3333..

Repeating decimal appears to be the most common definition according to : Ngram

Source:http://wiki.tcl.tk/3310

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