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Because 8 is 2 cubed, you can test if a number is divisible by 8 by dividing it by 2 three times. If the number you reach is an integer, then the number is divisible by 8. For example, 72/2 = 36/2 = 18/2 = 9. Therefore, 72 is divisible by 8.

For very large numbers, if the last three digits are divisible by 8, the number itself is divisible by 8.

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Q: How do you test if a number is divisible by 8?
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