10
11, 13, 17, 19, 23, 29 are the primes between 10 and 30 so the composite numbers are all the others. 12,14,15,16,18,20,21,22,24,25,26,27,28, and 30 are the composite numbers between 10 and 30.
Every even number is evenly divisible by 2.
Simply add up the primes - those numbers other than 1 whose only factors are 1 and themselves. 2,3,5,7,11,13,17,19,23,29 are all the primes from 1 to 30. There are 10 of them, and the set of integers from 1 to 30 encompasses 30 numbers, so 1/3 of the integers from 1 to 30 are prime. Technically there are infinite NUMBERS between 1 and 30 (0.1, 9.57, 0.000001, ...) but only 30 integers (1,2,3, ...). If the question is phrased with the word "numbers" and not "integers" then the answer should technically be 10 primes divided by infinite numbers, and anything over infinity is 0, so your answer would be 0. So answer either 1/3 or 0; if you haven't really talked about infinity then it is probably 1/3 they are looking for.
Well, darling, between 30 and 60, we have the prime numbers 31, 37, 41, 43, 47, 53, and 59. So, there you have it, a prime selection of numbers for you to enjoy. Now, go forth and conquer those primes like the math whiz you are!
The only twin primes (prime numbers which differ by 2) between 30 and 60 are (41, 43)
10
11, 13, 17, 19, 23, 29 are the primes between 10 and 30 so the composite numbers are all the others. 12,14,15,16,18,20,21,22,24,25,26,27,28, and 30 are the composite numbers between 10 and 30.
31 and 37 are the only two so there are two primes between 30 and 40.
Every even number is evenly divisible by 2.
Factors are prime numbers. The primes hidden in the number 30 are: 2,3, and 5.
Just 47.
29 is already prime. Prime numbers can't be products of primes.
They are: 31 and 37
23 and 29
Simply add up the primes - those numbers other than 1 whose only factors are 1 and themselves. 2,3,5,7,11,13,17,19,23,29 are all the primes from 1 to 30. There are 10 of them, and the set of integers from 1 to 30 encompasses 30 numbers, so 1/3 of the integers from 1 to 30 are prime. Technically there are infinite NUMBERS between 1 and 30 (0.1, 9.57, 0.000001, ...) but only 30 integers (1,2,3, ...). If the question is phrased with the word "numbers" and not "integers" then the answer should technically be 10 primes divided by infinite numbers, and anything over infinity is 0, so your answer would be 0. So answer either 1/3 or 0; if you haven't really talked about infinity then it is probably 1/3 they are looking for.
Sure. All composite numbers can be written as a product of primes. It shouldn't be tough to find a composite number that's the sum of three other composite numbers. Let's try 30. 2 x 3 x 5 = 30 Product of primes, check. 6 (2 x 3) + 10 (2 x 5) + 14 (2 x 7) = 30 Sum of three products of primes, check.