Find the sum of the digits of all the numbers from 1 to 100.
1-100
(1+100) (2+99) (3+98)... (50+51)
(101 x 50) = 5050
The sum of the DIGITS of all numbers from 1 to 100 =1+2+3+4+5+6+7+8+9+1+0+1+1+1+2+1+3+1+4+1+5+1+6+1+7+1+8+1+9+2+0......etc=901 including 100.
