Number PlayClass 8 Mathematics Flashcards

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Question

What is the rule to check if a number is divisible by 9?

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Answer

A number is divisible by 9 if and only if the sum of its digits is divisible by 9. For example, for the number 405, the sum of digits is 4+0+5=94+0+5=9. Since 9 is divisible by 9, the number 405 is divisible by 9.

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