# Money Pelia

May 5th, 2015
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A factor of a given number is every number that divides exactly into that number. Example Write down all factors of 10. 10 = 2 x 5, so numbers 2 and 5 are factors of 10. Also 10 = 10 x 1, so 10 and 1 are factors of 10.

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Money PeliaFACTORA factor of a given number is every number that divides exactly into that number. ExampleWrite down all factors of 10.10 = 2 x 5, so numbers 2 and 5 are factors of 10.Also 10 = 10 x 1, so 10 and 1 are factors of 10.The factors of 10 are 1, 2, 5, 10.NOTE: Number 1 and the number itself are always factors of any number. PRIME AND COMPOSITE NUMBERS.A prime number has exactly 2 factors, the number itself and 1. In other words, the prime number can be divided only by 1 and by itself. NOTE: 0 and 1 are not prime numbers.Example: 5 is a prime number, because the only factors it has are 1 and 5.The prime numbers less than 20 are 2,3,5,7,11,13,17,19Example:Find all prime factors of 30.Solution:All the factors of 30 are 30, 15, 10, 6, 5, 3, 2, 1But only 5, 3 and 2 are prime numbers.Thefore all prime factors of 30 are 2, 3 and 5.A composite number has at least one more factor that the number itself or 1. In fact, all whole numbers that are not prime are composite except for 1 and 0, which are not prime and not composite.The composite numbers less than 20 are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18 DIVISIBILITY RULESThe simple divisibility rules will help you to find factors of a number.The number is divisible by:2 if the last digit is 0, 2, 4, 6, or 8 (example: 12346); 3 if the sum of digits in the number are divisible by 3(example: 1236, because 1+2+3+6 = 12 = 3 x 4);4 if the last 2 digits are divisible by 4(example: 897544, becau

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