When you multiply any two real numbers you ge a real Number.
Real number={Natural Number, Whole Number, Integer,Rational Number, Irrational Number}
→"0" is the Multiplicative Identity of all the set of Numbers which lies in the set of Real number including Set of Real number also.
So,→ Any Natural Number × 0=0
5 ×0=0
→Any Whole Number × 0=0
6×0=0
→Any Integer × 0=0
-3 × 0=0
4×0=0
→Any Rational Number × 0=0
→Any Irrational Number × 0=0
→√3 × 0=0
⇒Any Real Number × 0 =0
→7.45×0=0
→7.232232223.....×0=0