Q: How many numbers up to 100 are divisible by 7?

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Clearly, both 810 and 910 are divisible by 5. A wee trick regarding numbers that are a multiple of 3, is that the component numbers, when added together, are divisible by three. So, 654 is divisible by 3, as 6+5+4 = 15 which is divisible by 3. In your example, 810 components add up to 9, which is divisible by 3. But the components of 910 add up to 10 which is not so divisible.

Prime numbers go on forever.

No, even numbers are evenly divisible by two, which means that only the multiples of two are even numbers. Odd numbers make up the other integers. There is no such thing as an odd or even decimal.

There are 25 prime numbers up to 100. They are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97.

Well, honey, 5671 is divisible by 1, itself, 47, and 120. So, if you're looking to break up with 5671, those are the lucky numbers that can divide it without any drama.

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The numbers divisible by nine up to a 100 are 9,18,27,36,45,54,63,72,81,90,and,99

Any of its multiples up to 100

100 is divisible by 5. The next is 105, the next is 110, and so on forever.

Any number ending in a 5 or 0 !

Numbers up to 200 divisible by both 2 and 3 = numbers to 200 divisible by 2*3 = 6 which is int(200/6) = int(33.33) = 33

Just count up all the even numbers which will all be divisible by 2

There are 80 such numbers.

Depending on how you look at it, there are either 99 or 100 whole numbers up to 100. If you mean up to and including 100, then the answer is 100 whole numbers, if not, then the answer is 99 whole numbers.

There are 25 prime numbers up to 100.

Counting up from 1, there is a number divisible by 3 every 3 numbers. Thus to find out how many numbers are divisible by 3, we just have to divide the number we're counting to by 3. In this case, the top number is 50, so do: 50/3 = 16 with two remainder. Because the numbers divisible by 3 come last in every set of 3 numbers, we can discard the remainder. Therefore there are 16 numbers between 1 and 50 that are divisible by 3.

A number is divisible by 9 if all the digits add up to 9 or are a factor of. IF the digits add up to 9 (or a factor of 9), they will automatically be a factor of 3.Yes. Test a couple numbers divisible by 9--27, 81--and they are all divisible by 3.