One sixth is smaller than one fifth. For example, if a pizza pie is split into 6 pieces and another pizza pie that is split into 5 pieces, a slice from the 5 slice pie is bigger.
One sixth is not a whole number. Expressed as a decimal, it is equal to 0.16 recurring (that is, 0.16666..)
one-fifth = 1/5 as a fraction or 0.2 as a decimal
1/6 x 1/5 is 1/30.
one half is greadest
There are infinitely many fractions between one sixth and three fifths.
One fifth of a number k = 1/5 of k = k/5 and similarly with other unit fractions.
There hasn't been a fourth or fifth yet. The fourth one is in production. A sixth one is unlikely.