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.