Question

Find the sum of digits of each multiple of 99.1 =9 99.2=18 1+8 =99.3=279.4=36

Answer 1

9*1 = 9 9

9*2=18 1+8 = 9

each result has 2 digits ( except the first one that is only 9) add them

27 , 2+7 = 9

36, 3 +6 = 9

45, 4+5 = 9

54, 5+4 = 9

63, 6+3= 9

72, 7+2= 9

81, 8+ 1=9

The pattern is that always the sum of the digits is equal to 9.