RIDDLE 21: MATH SWAG

                                                                                                          

1.       The number  which  was  not included in Roman numerals.

2.       What does this symbol mean?

3.       -5/2 ,7, 0.25 are ________  numbers.

4.       All numbers are included in the set of _______ numbers.

5.       The identity element of multiplication

6.       “>” meaning of this symbol

7.       Meaning of  {  } or  ∅

8.       -7,3,7 are _________ numbers

9.       |992-1000|=?

10.   Let x ∈ Z ; if -1 < x ≤3 The greatest values for the following  3x

11.   Zero is ___________ element of multiplication

12.   7(0+9)-(4.14) =?