How Do You Divide By 11 Quickly? [Solved]

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How Do You Divide By 11 Quickly? [Solved]

Here an easy way to test for divisibility by 11. Take the alternating sum of the digits in the number, read from left to right. If that is divisible by 11, so is the original number. So, for instance, 2728 has alternating sum of digits 2 – 7 + 2 – 8 = -11.

Divide by 11 Mentally II Calculate 10 times Faster

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