A Points Very Much Important For Exams
A notes 1. A factor of a number is an exact divisor of that number. 2. 1 is a factor of every number. 3. Every number is a factor of itself. 4. Every factor is less than or equal to the given number. 5. Number of factors of a given number are finite. 6. Every multiple of a number is greater than or equal to that number. 7. The number of multiples of a given number is infinite. 8. Every number is a multiple of itself. 9.The number 1 has only one factor (i.e. itself ). 10. 1 is neither a prime nor a composite number. 11. 2 is the smallest prime number which is even. 12. Every prime number except 2 is odd. 13. If a number has 0 in the ones place then it is divisible by 10. 14. A number which has either 0 or 5 in its ones place is divisible by 5. 15. A number is divisible by 2 if it has any of the digits 0, 2, 4, 6 or 8 in its ones place. 16. If the sum of the digits is a multiple of 3, then the number is divisible by 3. 17.