In various types of numbers we will learn about even numbers, odd numbers, prime numbers, composite numbers, co-prime numbers and twin prime numbers along with the example:
A whole number exactly divisible by 2 is called even numbers.
2, 4, 6, 8, 10, 12, 14, 16..........................are even number. Or a number having 0, 2, 4, 6, 8 at its units place is called an even number.
246, 1894, 5468, 100 are even number.
Any two even numbers which differ from one another by 2 are called consecutive even number.
A whole number which is not exactly divisible by 2 is called an odd number.
3, 5, 7, 9, 11, 13, 15, are odd number.
Or a number having 1, 3, 5, 7 and 9 at its units place is called an odd number.
Number s which have only two factors namely 1 and the number itself are called prime numbers.
2, 3, 5, 7, 11, 19, 37 etc are prime numbers.
Numbers having more than two factors are called as composite numbers.
4, 6, 8, 10 etc are composite numbers.
(a) 1 is neither prime nor composite.
(b) 2 is the lowest and the only even prime number.
(c) 9 is the lowest odd composite number.
Two numbers are said to be co-prime if they do not have a common factor other than 1 or two numbers whose HCF is 1 called co-prime numbers.
Co-prime numbers needs not be prime numbers.
(i) 7 and 10 are co-prime.
(ii) 15 and 17 are co-prime.
Twin Prime Numbers
Twin prime numbers are the two prime numbers whose difference is 2.
(i) 3 and 5
(ii) 17 and 19
(iii) 41 and 43
(iv) 29 and 31
(v) 71 and 73.
5th Grade Math Problems
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