🦿 Lucian Marin Sum of digits of all numbers ending with 9 is equal to the first digit. Examples: 19 = 1 + 9 = 10 = 1, 299 = 2 + 9 + 9 = 20 = 2, 5999 = 5 + 9 + 9 + 9 = 32 =5.
Login or register your account to reply