dbarlam dbarlam

04-02-2021
Mathematics

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How can you tell without doing division if a number is a multiple of 9?

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StarDev StarDev

04-02-2021

1. List out the prime numbers of 9.

The prime numbers of 9 is 3.

2. To prove, you can multiply 3 by 3.

3 x 3 = 9

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