Question

name all sets of numbers for 7.2

Answer 1

That's a verrrrrry interesting number ! 
It belongs to an infinite number of sets,
and I'm pretty busy right now.

Here are just a few of them:

-- real numbers
-- rational numbers
-- positive numbers
-- mixed numbers
-- multiples of  0.1
-- multiples of  0.2
-- multiples of  0.3
-- multiples of  0.4
-- multiples of  0.6
-- multiples of  0.8
-- multiples of  0.9
-- multiples of  1.2
-- numbers less than  7.21
-- numbers less than  7.22
-- numbers less than  7.23
.
.
etc.

-- numbers greater than  7.19
-- numbers greater than  7.18
-- numbers greater than  7.17
.
.
etc.