Puzzle:

2. Find the sum of the digits of each multiple of 9 below.

Sum of digits

1 + 8 = 9

9.1 = 9

9.2 = 18

9.3 = 27

9.4 = 36

9.5 = 45

9.6 = 54

9.7 = 63

9.8 = 72

9.9 = 81

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