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What is the highest number that cannot be divided by 7 or 3?
There are infinitely many such numbers. For example, 21*n + 1 will not be divisible by 7 or 3 for any n - no matter how large.
Is 6615 divisible by 5?
Yes, 6615 is divisible by 5. Here's a hint, no matter the size of the number, if it ends in 5 or 0, it is divisible by five (5).
How many numbers are there between the squares of 12 and 13?
Infinitely many. There are infinitely many numbers between any two numbers - no matter how close to each other they are.
What fractions are closest to zero?
There are no such fractions. No matter how close a fraction is to zero, there are still infinitely many that are closer.
Is 120 the smallest number that is divisible by 1 2 3 6 9 12 and 36?
No.First off, 120 is not divisible by 9. (The sum of the digits of 120 is "3"; a number is divisible by nine if and only if the sum of its digits is divisible by nine.) For that matter, it's not divisible by 36 either; since 36 is itself divisible by 9, any number which is not divisible by 9 cannot be divisible by 36.The smallest number that's divisible by 1, 2, 3, 6, 9, 12 and 36 is "36" (it's also divisible by 4, which you left out).
