This is a set of notes that teach, contain summaries and have example questions (with answers and corrections) about numbers (rational, irrational etc.), ratio and rate, and financial maths. This set helps you understand more in depth on these subjects. Although it is in the syllabus for grade 9, t...
REAL NUMBERS (R) NON-REAL NUMBERS
All numbers represented on anumber negative numbers
line
All rational and irrational numbers
RATIONAL NUMBERS (Q) IRRATIONAL NUMBERS (Q)
Allfractions
Non-recurring and non-terminating
Any decimal that terminates or
recurs decimals
Allintegers, whole numbers and non perfect squares
natural numbers
non perfect cubes
INTEGERS (Z)
{..;-2; -1;0;1;2; ... )
WHOLE NUMBERS (No)
{0;1;2;3; .. )
NATURAL NUMBERS (N)
{1;2;3;4; ...)
2|ae
, RATIONAL NUMBERS
KaTional numbers are numbers thot can be written as a where aand
frGCIi
bare integers, but b0.
Example: -2=;0,333333
1 - : 0,=i;-7
2
2
10
IRRATIONAL NUMBERS
We knowthat the v1= 1 and v4 =2
:. surely N3 has a value between 1 and 2? So, V3 = 1,...
And since 3 is closer to 4 than 1, maybe 3 is closer to 2 than 1.
Check on your calculator.
Now, let's find the position of v3 on the number line.
1 2
1.73
V3 =1,732050808...calculator
V3 1,73 (correct to 2 decimal digits)
So, this number does exist - it is REAL!
But,we can only get an approximate value of it.Notice howthe digits after the
decimal have no pattern at all and go on and on.
Irrational numbers are infinite, NON-RECURRING (no pattern) decimals.
ACTIVITY 1
Complete the following table by ticking ()and crossing (x) the correct
column(s):
Simplify the nurnber first, if necessary.
NUMBER IR Q' No N
3,14159
22
7
-5
1.121122111..
3|PaRe
, No N
NUMBER R
0,333..
49
|25
-10
-2
/o,008
V9
We carn use an inequality symbol to represent sets of numbers in Maths
Example:
List the set of numbers represented by each of the following inequalities:
a) X<6,x ENo
2
b) x<5:xEN
I;2, 3;4,5
c) -4<x<1:xeZ
Interval
notodn
-4, 3,-2, -,0. -42
(only
reealo )
usebroc
kels
d) What about the following? X> 2;xE R
tion
el buldet notati
)
3
4|?e
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller sofiafrenchza. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $4.62. You're not tied to anything after your purchase.
