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Rationalize

Converts a decimal number to a rational approximation.

$ wo 'Rationalize[0.5]'
1/2

$ wo 'Rationalize[0.333333]'
0.333333

$ wo 'Rationalize[0.25]'
1/4

$ wo 'Rationalize[3]'
3

With a tolerance argument, finds a rational within that tolerance:

$ wo 'Rationalize[0.333333, 0.0001]'
1/3

$ wo 'Rationalize[0.333333, 0.00001]'
1/3

Numbers with up to 5 decimal places are rationalized:

$ wo 'Rationalize[0.33333]'
33333/100000