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Clearly, both 810 and 910 are divisible by 5.

A wee trick regarding numbers that are a multiple of 3, is that the component numbers, when added together, are divisible by three. So, 654 is divisible by 3, as 6+5+4 = 15 which is divisible by 3.

In your example, 810 components add up to 9, which is divisible by 3.

But the components of 910 add up to 10 which is not so divisible.

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9y ago
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Aurora Harvie-Emmens

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2y ago
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Q: What is equally divisible by 3 and 5 810 or 910?
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