Factorisation of Numbers Workbook-1

Factorisation of Numbers Workbook-1


Factors are the numbers that are multiplied to give a product.

If a number ‘a’ is divided by ‘b’ and remainder is zero than ‘b’ is said to be factor of ‘a’


Co-Prime Numbers:

Two numbers (not necessarily prime) are co-prime, if they have only 1 as common factor.

e.g., (1, 2), (1, 3), (3, 4), (3, 10), (3, 8), (5, 6), (7, 8) etc.

These numbers are also called as relatively prime numbers.



(a) Two distinct prime numbers are always co-prime but converse need not be true.

(b) Consecutive numbers are always co-prime numbers.


Twin Prime Numbers:

If the difference between two prime numbers is two, then the numbers are called as twin prime numbers. e.g., {3, 5}, {5, 7}, {11, 13}, {17, 19}, {29, 31}.