Question

2 digit number from 1 to 90 is answer 81 how like explain plz​

Answer 1

Answer:

I think that question is wrong check once

Answer 2

Answer:

90-9=81

one digit numbers : 1,2,3,4,5,6,7,8,and 9. total no=9. these numbers have only unit digit , unit digit ×10^0=unit digit