only even prime number

only even prime number

• Even and Odd Integers: Integers divisible by 2 are known as even only even prime number while only even prime number which are not are known as odd integers.
• Prime Numbers: Numbers only even prime number than 1 is called so, if it has exactly two factors, namely 1 and itself.

      #There are 25 prime nos. between 1 and 100#

      #To find if a number is prime or not#

          - Ex. To find if 165 is prime or not.

            > Take the nearest value of âĆš165 is 13

                 that is 13>âĆš165.       

            > So test the divisiblity of 165 by each of  the prime numbers less than 13.

            > If it is divisible any of those nos. then it is not prime.(Here 165 is divisible by 11; hence not prime).

            > If it is not divisible by any of those nos. then it is a prime no.

• Composite Numbers: Numbers greater than 1 which are not prime nos. are called composite nos.

      # 1 is neither prime nor composite#

      # 2 is the only even prime number#

• Division on Numbers:

       Division Algorithm:

Formula: Dividend=(Divisor*Quotient) +Remainder.

Ex: When 123 is divided by 16, we have

       Dividend= 123.

       Divisor= 16

       Quotient= 7

       Remainder= 11

       Therefore, 123=16*7+11.

• Tests of Divisibility.

1. Divisibility by 2: A number is divisible by 2 if its units digit is divisible by 2. Ex: 4326894.
2. Divisibility by 3: A number is divisible by 3 if the sum of its digits is divisible by 3 .  Ex:693258.
3. Divisibility by 4: A number is divisible by 4 if its last two digits is divisible by 4. Ex: 738924.
4. Divisibility by 5: A number is divisible by 5 if its unit digit is either 0 or 5.
5. Divisibility by 8: A number is divisible by 8 if its last three digits is divisible by 8.Ex: 73512.
6. Divisibility by 9: A number is divisible by  if its sum of all digits is divisible by 9. Ex: 1458.
7. Divisibility by 11: A number is divisible by 11 only even prime number difference of the sum of digits at odd places and sum of digits at even places is either 0 or is dividible by 11. Ex: 684387.

Part I

Go to WordsEveryday

Popular topics today: give me liberty or give me death, black velvet lyrics, lake superior, opposites attract lyrics, cartographers, you light up my life lyrics, matthew higa, homophone, cloverfield ending, cloverfield monster, buynowbe

Post je objavljen 18.01.2008. u 12:40 sati.