All common multiples of 7, 10 and 8 are divisible by them.
The lowest common multiple of them is 280, so all multiples of 280 are divisible by them, namely 280, 560, 840, 1120, ...
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The smallest number that is divisible by the numbers 1 through 10, except 7 and 8, is 180.
All multiples of 10 end in a zero To be divisible by 10, the last digit must by a 0 The last digit of 78 is an 8 which is NOT a 0, so 78 is NOT divisible by 10.
56
8/7 = 1.14285714
It is not divisible by 10. The remainder is 8.