4. Number Theory 1


Looking Back at 5th Class In 5th class we learned that:


factor × factor = product So in the mathematical sentence 3 × 4 = 12,


3 and 4 are factors of 12, which is the product. Does 12 have any other factors? What are they?


1. List all the factors of these products. a) 9


b) 15 c) 20


d) 24


e) 36


A prime number is a number whose only factors are itself and 1. For example, 11 is a prime number because its only factors are 1 and 11.


A composite number is a number that has more than 1 pair of factors. For example, 8 is a composite number because its factors are 1, 2, 4 and 8.


2. True or false? a) A factor is one of the numbers in a multiplication question. b) factor × factor = product c) The only factor a prime number has is 1. d) A prime number can be a composite number. e) A composite number has more than one pair of factors. f) 1 is a prime number. g) 2 is a prime number. h) All odd numbers are prime numbers. i) All even numbers are composite numbers. Discuss your answers with the people near you.


Strand: Number 32


Curriculum Objectives: Identify simple prime and composite numbers; identify common factors and multiples.


f) 48


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