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Q: How may numbers between 1 and 400 are divisible by 7?

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All numbers are divisible by all numbers... They may turn out like decimals and imaginary numbers, but they can be divided. Now, whether 3 can be evenly divided into 6008 is a different question. And that answer would be no.

Greatest common factor(GCF) of two consecutive even numbers is 2. The reason behind this is that both the numbers(even numbers) are divisible by 2, so 2 is the common factor. Also, both numbers differ by 2 so 2 is the only common factor except 1. If the difference is 4 then it may be possible that both numbers are divisible by 4. So, if the difference between two numbers is n then it may be possible that both the numbers are divisible by n and numbers less than n. 52 and 54 are two consecutive even numbers so their GCF is 2.

Any multiple of 4 will be divided evenly by 4, but other numbers can also be divided by 4 but may not be evenly.

150, but there may be other, lesser numbers as well. There is also 315.

Yes, by 250. Here's a trick I use to find out whether a number is divisible by 3. If you add up all the digits of the numbers it may equal a multiple of 3, if it does it's divisible by 3. For example. 750: 7+5+0=12, which is divisible by 3.

It is a set of numbers consisting of all numbers between two end numbers in a continuous domain. The two end numbers may or may not be included.

Sure it may be divisible by 8 - or it may not. For example, 40 and 1000 are both divisible by 8.

12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, and 48. As you may have noticed, all you have to do is count every third number.

Check if a number is divisible by 2. Then check divisibility by all odd numbers, up to the square root of the number. If it isn't divisible by any of those, your number is a prime number. For higher numbers, this method may be very slow - but you asked for EASY methods, and the faster methods are certainly not easy.

Integer numbers are a subset of real numbers. Real numbers may contain fractions.

Real numbers are infinitely dense. That means that between any two real numbers, there are infinitely may real numbers. One example: 2.00135

279 is divisible by at-least 3 and 9 there may be more but those are just a couple

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