All of the four-digit multiples of 400 end in 00.
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There can be no such number. If it is divisible by 5 and 6it must be divisible by 6.
To be divisible by 36 the number must be divisible by 9 (and 4). To be divisible by 9, the sum of the digits must be divisible by 9. 5 + 5 = 10 → need an extra 8 → A + B = 8.
Not necessarily. For example, the number 56 ends in a 6 but is not divisible by six. To check if a number is divisible by six, the number must be divisible by both 2 and 3. To check this, the last digit must be even and the sum of the digits must be divisible by three. If the number meets these conditions, it is in fact divisible by six.
Look at the last digit of the number; if it is even then the number is divisible by 2, otherwise it is not.
No. In order for a number to be divisible by 10, the ones digit must be zero (0).