7.1 PROPERTIES OF NUMBERS

Learning objectives

At the end of this lesson you are able to...

...explain what natural numbers are. 

...explain what prime numbers are. 

...explain what a divisor is.

...explain what divisible is. 

...explain when a number is divisible by 3, 4, 5, 6 and 9. 

...write a prime number as a product of prime factors.


Explanation video



Exercises

Do the exercises in your notebook and show your intermediate steps!

Exercise 1

Write down all divisors of. You may NOT use your calculator.

a) 16

b) 60

Exercise 2

Check whether these numbers are divisible by 3, 4, 5, 6 or 9. You may NOT use your calculator. 

a) 1035

b) 3245510977

Exercise 3

Find out which of these numbers are prime numbers. You are allowed to use your calculator. 

23        141        17        101        97        91

Exercise 4

a) Why is 12 not a prime number? 

b) What is the only even prime number? 

c) Give all prime numbers less than 30. 

d) Write 90 as a product of prime numbers. 

e) Write 72 as a product of prime numbers.