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Definitions-

Prime Numbers-

The numbers having only two factors are called Prime Numbers. Those factors are 1 and itself. Examples-2,3,5,7,9,11,13,19 etc.

Composite Numbers-

Numbers having more then two factors are called Composite Numbers. Example- 4,6,8,10,12,14,16,57 etc.

Twin Prime Numbers-

If the difference between the pair of Prime numbers is 2, then they are called Twin Prime Numbers. Example- 3 and 5 because 3-5=2

Co- prime numbers (or) Relatively Prime numbers-

If 1 is the only common factor for 2 numbers then that two numbers are said to be relatively prime or co-prime numbers. Example-12 and 13. The factors of 12 are- 1,2,3,4,6,12. The factors of 13 are- 1,13. 1 is the only common factor for 12 and 13. Hence 12 and 13 are relatively prime.

Multiples and Factors-

The numbers 2,4,6,8,10… are formed by multiplying natural numbers with 2.These numbers are Multiples of 2.We know that 3x3=6.Two is said to be factor of 6. 6 is said to be a multiple of 2.

Thought -

“Some mathematician has said pleasure lies not in discovering truth, but in seeking it.”

Maths Riddle-

How can you add eight 8's to get the number 1,000? (only use addition) 

 Answer-

The key to this math riddle is realizing that the one       place must be zero.
888 +88 +8 +8 +8 =1,000