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Question

Determine which of the following numbers are divisible by 5 and by 10. 25,125,250,1250,10205,70985,45880Check whether the numbers that are divisible by 10 are also divisible by 2 and 5.

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Solution

We know thatIf the unit digit of a number is 5 or 0, it is divisible by 5If the unit digit of a number is 0, it is divisible by 10If the unit digit of a number is an even number, it is divisible by 2Now, investigate for the given numbers.25= Here, unit digit is 5, so it is divisible by 5 only225= Here, unit digit is 5, so it is divisible by 5 only250= Here, the unit digit is 0, so the number is divisible by 5,10 and 21250= Here, the unit digit is 0, so the number is divisible by 5,10 and 210205= Here, unit digit is 5, so it is divisible by 5 only70985= Here, unit digit is 5, so it is divisible by 5 only45880= Here, the unit digit is 0, so the number is divisible by 5,10 and 2

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