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Jan Spence
Mathematics
7 September, 10:54
How is 225 divisible by nine
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Rowan Barton
7 September, 10:56
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A number is divisible by 9 if the sum of the digits is divisible by 9.
225 is divisible by 9 since the sum of the digits is 9, (2+2+5=19), and 9 is divisible by 9.
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Quinton Rose
7 September, 11:15
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A number is divisible by 9 if and only if the sum of its number is a multiple of nine.
2+2+5=9 hence 255 is divisible by 9.
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