Multiples, Factors & Primes

Sarah Owen
Mind Map by Sarah Owen, updated more than 1 year ago
Sarah Owen
Created by Sarah Owen almost 6 years ago
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Explanation of multiples, factors & primes

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Multiples, Factors & Primes
1 A prime number is a number greater than 1 which has only two factors: Itself & 1.
1.1 Prime numbers to 100: 2,3,5,7,11,13,17,19, 23,29,31,37,41,43,47, 53,59,61,67,71,73,79, 83,89,97
1.1.1 The sum of two prime numbers can be a prime number but only when one of the prime numbers is 2
1.1.1.1 2+3=5 2+5=7 2+11=13
1.1.2 A number written as the product of prime numbers is written in prime factor form
1.1.2.1 720 = 2 x 2 x 2 x 2 x 3 x 3 x 5 as prime factor form is 720 = 2(4) x 3(2) x 5 (brackets are to the power of)
1.1.2.1.1 2, 3, and 5 are prime factors of 720
2 Multiples of a number are the results of multiplying the number by a positive whole number.
2.1 15=3x5 308=4x7x11
2.1.1 15 is a multiple of 3 & also of 5
2.1.2 3 is a factor of 15. 5 is also a factor
2.1.3 308 is a multiple of 4, 7 & 11
2.1.4 4, 7 & 11 are factors of 308
2.1.5 The factors of a number are whole numbers that divide exactly into the number. The factor includes 1 & itself.
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