It is important to know the sets N, Z and R and how to graph these on the number line.
On page 23 of the Maths tables the sets of numbers that you need to know are listed - however it is easier to learn them here. When written in this order each set includes the numbers in the previous set.
On page 23 of the Maths tables the sets of numbers that you need to know are listed - however it is easier to learn them here. When written in this order each set includes the numbers in the previous set.
Natural Numbers - Symbol N = {1, 2, 3, 4, ... }, whole positive numbers.
Integer Numbers - Symbol Z = { ... – 3, – 2, – 1, 0, 1, 2, 3 ...}, whole positive and negative numbers (and zero)
Rational Numbers - Symbol Q = any number that can be written as a fraction using two integers, but you cannot have zero as the denominator because it is impossible to divide by zero. You will only be asked to show the sets N, Z and R on the number line. The set Q is used when you are asked to write your answer as a fraction.
Real Numbers - Symbol R = all the numbers on the number line. This includes the rational numbers and the irrational numbers (numbers that cannot be written as fractions e.g. pi, √2 etc.
An open or empty circle is placed around the 2 because 2 is not included. For less than or equal use a full or coloured in circle.
This video explains what rational and irrational numbers are.
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