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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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