1, 2, 4, 5, 8, 10, 16, 20, 40, 80
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Numbers that are divisible by 80 are itself and any of its other multiples
101
1, 2, 4, 5, 8, 10, 16, 20, 40, 80
If the last 4 digits are divisible by 80, the entire number is divisible by 80.But really, it is hardly worth-while to learn divisibility rules for a large amount of numbers; only for a few small numbers. Normally it is easier to just do the division.
Three of them.