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20 April, 15:21

Ayesha has a theory about two digits numbers that have a larger tens digit then ones digit. she says that reversing the digits and subtracting the reversed number from the original number will always generate a number that is multiple of 9. is ayesha right? if so why do you think this works? if not, why not?

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  1. 20 April, 16:43
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    Yes she is right. It works because the sum of the individual digits of the difference is divisible by nine.
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