Composite numbers less than 10 include 4, 6, 8 and 9, which add up to 27.
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∙ 2014-06-25 00:52:09No, the sum of a prime number and a composite number is not always even.
The sum of any two prime numbers is not always a composite number. The sum of 2 and 11 is 13, and 13 is a prime number, not a composite number.
2 is the smallest prime number. 9 is the greatest composite number less than 10. The sum of 2 and 9 is 11.
Composite.
Composite.
It is: 2+9 = 11
No, it is composite.
The sum of the composite numbers that are less than 8 is: 4+6 = 10
The first number is odd, the second is odd. Odd + Odd = Even ie the sum is even. Either number is greater than 2 so their sum is greater than 2. All even numbers greater than 2 are composite.
No.
693 can be divided by 3 ==> composite number. This is an easy prime because if you make a sum of all the digits: 6 + 9 + 3 = 18, if you can devide this sum by 3 than you can also divide the original number by 3.
The sum of the prime factors of 6 is closest in value to the composite number 6.