the answer is 1+9 =10,2+9=1.The trick is one less and add an one in frount of it.
9.
The sum of 2/9 and 1/3 is 5/9
13
5 5+4 = 9 52+42 = 41
The angle sum of any polygon is 360 degrees.
The numbers are 4 and 5: 4 + 5 = 9
8+y is the sum of 8 and y
The sum of 9 and 5 is 14
The sum of 19 and 9 is 28.
The sum of 1 + 8 is 9.
The sum of 14 and 9 is 23.
the sum is the answer to an addition problem e.g.4+5=9 9 is the sum
9+a.
9, 18, 27, ... All numbers whose digital sum is 9. A digital sum is the sum of all the digits of a number. If the sum happens to be greater than 9 then repeat the process of obtaining a digital sum until the result is 9 or smaller.
twenty one (21) is the sum of 12 and 9.
The sum of 8, 11 and 9 is 28.
-23 is the sum of -32 and 9
135 is the sum