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If a number is a multiple of nine, its digit root (the sum of its digits until the answer is only one digit long) is 9 (for multiples of 3, this is the case if the digital root is 3, 6 or 9).
For 163, 1 + 6 + 3 = 10. 1 + 0 = 1 so the digital root is 1 and therefore 163 is not a multiple of 9.
However, for 162, 1 + 6 + 2 = 9 so the digital root is 9 so 162 is a multiple of 9 (18 x 9 = 162).
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Earn +20 ptsQ: Is this the multiples of nine 162 or 163?
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