Can you find the missing numbers ? What’s the connection ?

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Presentation transcript:

Can you find the missing numbers ? What’s the connection ? Factors Can you find the missing numbers ? What’s the connection ? 1 3 12 6 4

Factors The numbers in the outer circles are factors of the numbers in the centre of the circle. Example The factors of 12 are 12,6,4,3,2,and 1.

Squares and Primes Some of your factor diagrams have only two factors, these numbers are called prime numbers. Another group of diagrams have an ODD number of factors around the centre number. These are the square numbers.

Squares and Primes Make a list of the numbers 1 to 30 and their factors. Make a note if they are prime of square numbers. Example Number Factors Type 1 Square 2 1,2 Prime 3 1,3

Multiples 3,6,9,12,15 …. etc. Are multiples of 3. How would you explain what a multiple is?

Common Multiples 3,6,9,12,15,18,21,24,27,30,33,36 4,8,12,16,20,24,28,32,36,40,44,48 Examine the lists above. Which numbers are multiples of 3 and 4 ? We call these numbers common multiples. Which is the lowest common multiple ? Can you predict what the next common multiple will be ? Explain how you did it.

Primes and Prime Factors Some Facts Numbers which have exactly two factors are called PRIME NUMBERS. 2 is the first prime number and the only even prime number.

Card Puzzle You will need at set of 1 to 50 number cards. Work with a friend and sort the numbers into two groups, PRIMES and NON PRIMES.

Here is a prime factor tree for 36.