Question

is square root of 72 rational or irrational

Answer 1

square root of 72 is rational

Answer 2

There are six common sets of numbers.
Natural (Counting) Numbers:
{
1
,
2
,
3
,
4
,
5
,
…
}
1,2,3,4,5,…
Whole Numbers: Natural Numbers and
{
0
}
0
Integers:
{
…
,
−
3
,
−
2
,
−
1
,
0
,
1
,
2
,
3
,
…
}
…,-3,-2,-1,0,1,2,3,…
Rational Numbers: Integers, Fractions, and Terminating or Repeating Decimals
Irrational Numbers: Non Terminating or Non Repeating Decimals
Real Numbers: Rational Numbers and Irrational Numbers