18, 1 + 8 = 9
27, 2 + 7 = 9
99, 9 + 9 = 18
9918, 9+9+1+8 =27
all number that divided by 9 have this characteristic
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Any number, real or imaginary, can be the sum of another number plus 9.
It is the number 9.
a digit is any number from 0 to 9
When you multiply a number by itself, you square the number. The square of 3 is 9.
X + 9 < 5