Question 205489
Visualize  the  100"s  chart,,,1-9,,10-19,,20-29,,etc
.
let's  start  at  the  90's  row,,,100  is  3  digits  so  it  doesn't  count
90,91,92,93,94,95,96,97,98,,(but  not  99)  all  have  less, net 9
.
The  80's  row,,,80,81,82,83,84,85,86,87,(but  not 88,89),,,net 8
.
The  70's  row,,,70,71,72,73,74,75,76,,(but  not 77,78,79),,,net 7
.
The 60's row,,60,61,62,63,64,65,( but  not 66,67,68,69),,net 6
,
The  50's  row,,,50,51,52,53,54,(but not 55,56,57,58,59),,net 5
.
The 40's  row,,,40,41,42,43,(but not 44,45,46,47,48,49),,,net  4
.
The 30,s row,,,30,31,32,(but  not 33,34,35,36,37,38,39(,,,net 3
.
The 20's row,,,20,21,(but  not  22,23,24,25,26,27,28,29),,net 2
.
The 10's row,,,10,(but  not 11,12,13,14,15,16,17,18,19),,,net 1
.
The 1's row,,,,none  because  all  single  digits,,,,net 0
.
Adding  all  of  those  available (9+8+7+6+5+4+3+2+1) = 45
.
of  interest,  total  numbers  is  99-9=90,,,therefore half have greater  and  half equal or less  digits.