Divisibility by 25

100 is divisible by 25.

Every number which ends with two zeros is divisible by 25

For example: 300, 600, 700, 800, 5000, 9000

Let us observe numbers which does not end with zeros like 8375 and 8345
We present those numbers like sum of two addends and one of the addends ends with two zeros 8375 = 8300 + 75 and 8345 = 8300 + 45

Because the two addends of the first sum(8300 and 75) are divisible by 25 and the whole number 8375 is also divisible by 25, but because the second addend(45) of the second sum is not divisible by 25 the whole number 8345 is also not divisible by 25

Numbers divisible by 25 are only those which have last two digits zeros or digits which express number divisible by 25

For example: 800, 1100, 34 000, 5275, 12825, 14350 are divisible by 25
355, 8640, 12395 are not divisible by 25

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