Fractions is how to split things into equal pieces. There are two things in a fraction and its called a numerator and denominator.
Unit fractions is one whole fraction sliced into equal pieces because unit means one so that means it is one whole fraction.
ordered fractions is ordering them into biggest to smallest like ordereing rocks biggest to smallest.
Numerator is what fraction it like a quarter, third and more.
A denominator is how many pieces there are in the fraction.