Page 8 - Mathematics Grade 11 Manual
P. 8
GR 11 MATHEMATICS - Unit 1: Number and number relationships 7
1. THE REAL NUMBER SYSTEM
Real numbers
Rational numbers Irrational numbers
e.g.
Natural numbers Whole numbers Integers
{1; 2; 3; …) {0; 1; 2; …} {…;-1; 0; 1; …}
Real numbers: Real numbers is a set of numbers that is made up of both rational and
irrational numbers.
s
Rational numbers: A rational number is a number that can be written in the form
l
where s and l are integers and l is not equal to zero.
s
Z
;s , ,l ;l 0
l
Irrational numbers: An irrational number is a number that cannot be written in the
s
form .
l
Natural numbers: Natural numbers is a set of numbers which starts with the number
one and increases in units of one to infinity.
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