You're only supposed to ask one question at at time but here we go:-
1 Fractions are parts of whole numbers or integers
2 Fractions less than 1 are common fractions
3 Fractions greater than 1 are improper fractions
4 Fractions have denominators which are underneath their numerators
5 Fractions are separated by a solidus line such as n/d
6 Fractions that are improper can be changed into mixed numbers
7 Fractions can be changed into decimals
8 Fractions can be converted into percentages
9 Fractions are rational numbers
10 Fractions can not be derived from Irrational Numbers
11 Fractions need a LCD when adding or subtracting them
12 Fractions can be easily multiplied and divided
13 Fractions can be equivalent such as 2/3 = 4/6
14 Fractions can be simplified by finding their HCF
15 Fractions use prime numbers to find the LCM of different denominators
16 Fractions were once used by the ancient Romans to a limited extent
5/3
1 4/15
it is a odd number
4/12= 5/15
to make them as simple as possible
See related question: 'What are 15 or more facts about fractions'
Yes their is an interesting fact about fractions that is you have to know how to do them
5/3
1 4/15
2 over 3
it has a numerator
it is a odd number
2/3, 4/6
16/30 or 17/30, for example.
8/30 and 12/45
4/12= 5/15
to make them as simple as possible