The document defines and provides examples of different types of real numbers, including natural numbers, whole numbers, integers, rational numbers, and irrational numbers. It explains that the set of real numbers contains all rational and irrational numbers. The key properties of real numbers are described, such as closure, commutativity, and distributivity. The real number line is introduced as a way to visually represent and order real numbers on a line. Examples are provided to demonstrate how to classify numbers as rational or irrational, positive or negative, and plot them on the real number line in relation to zero.
This is meant for age group 11 to 14 years.
For Class VIII CBSE.
Some viewers have requested me to send the file through mail.
So I allowed everybody to download.My request is whenever you are using plz acknowledge me.
Pratima Nayak ,Teacher,Kendriya Vidyalaya,Fort William,Kolkata
pnpratima@gmail.com
Based on Text book
CBSE Class 10 Mathematics Real Numbers Topic
Real Numbers Topics discussed in this document:
Introduction
Rational numbers
Fundamental theorem of Arithmetic
Decimal representation of Rational numbers
Terminating decimal
Non-terminating repeating decimals
Irrational numbers
Surd
General form of a surd
Operations on surds
· Addition and subtraction
· Multiplication of surds
More Topics under Class 10th Real Numbers (CBSE):
Real numbers
Laws of
logarithms
Common and natural logarithms
Visit Edvie.com for more topics
This is meant for age group 11 to 14 years.
For Class VIII CBSE.
Some viewers have requested me to send the file through mail.
So I allowed everybody to download.My request is whenever you are using plz acknowledge me.
Pratima Nayak ,Teacher,Kendriya Vidyalaya,Fort William,Kolkata
pnpratima@gmail.com
Based on Text book
CBSE Class 10 Mathematics Real Numbers Topic
Real Numbers Topics discussed in this document:
Introduction
Rational numbers
Fundamental theorem of Arithmetic
Decimal representation of Rational numbers
Terminating decimal
Non-terminating repeating decimals
Irrational numbers
Surd
General form of a surd
Operations on surds
· Addition and subtraction
· Multiplication of surds
More Topics under Class 10th Real Numbers (CBSE):
Real numbers
Laws of
logarithms
Common and natural logarithms
Visit Edvie.com for more topics
To download -https://clk.ink/MS2T
this will lead to a google drive link./
its a ppt based on the topic no. system.
it covers all the basics of ninth class cbse.
Al Diyafah High School is one of the most famous high schools in Dubai. Housing mainly Indian expatriates, this school also has 23 other nationalities studying within its four walls. But is this culturally diverse school a good place for your kid to start his/her schooling? Read our take on the Diyafah International School to find out:
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
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Algebra 101 real numbers and the real number line
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Algebra 101: Real Numbers and the Real Number Line
What Are Real Numbers?
Let’s start from the basics:
A set can be defined as a collection of objects that are grouped within parenthesis { }, and
each object is known as an element. A subset is a set that has elements that are present in
a given set. An empty set has no elements and it’s denoted as { } or ∅ .
Sets are one of the main focuses in maths. The set of natural numbers is represented with
N:
{1,2,3,4,5,…}
The three periods (…) is an ellipsis that shows that the numbers are infinite.
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MTS | My Tutor Source | https://mytutorsource.com/
The set of whole numbers is represented with W. It consists of natural numbers and zero.
{0,1,2,3,4,5,…}
The set of integers has zero, positive and negative numbers. It’s represented as Z.
{…,−3,−2,−1,0,1,2,3,…}
The sets of whole and natural numbers are subsets of the integers’ set.
Rational numbers are numbers in the form of ab, where b is non zero, and a and b are
integers. They’re denoted as Q and b is nonzero. Decimals that terminate or repeat are
rational.
0.7 = 710 AND 0.3 = 0.3333⋯ = 13
Irrational numbers are numbers that can’t be written in the form of a ratio of two integers.
Non-repeating, non-terminating decimals are irrational.
π=3.14159… AND2 = 1.41421…
The set of real numbers is a set containing all rational numbers and all irrational numbers.
It’s denoted as R. So, all the sets discussed above are subsets of the set of real numbers.
You can extend real numbers by adding the imaginary number i, which is equal to sqrt(-1) (-
1). Moreover, numbers in the form of x+iy, where x and y are both real, also form a field,
and are called complex numbers. Another extension is the surreal numbers that include
both the infinite ordinal numbers of Georg Cantor and real numbers.
Related Read: https://mytutorsource.com/blog/how-mts-tutors-can-help-you-in-improving-
your-mathematics/
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MTS | My Tutor Source | https://mytutorsource.com/
Real Numbers Examples
Natural numbers {1, 2, 3,…}
Whole numbers {0, 1, 2, 3,…}
Integers
Decimal numbers
Rational numbers
Irrational numbers
Integers Z {…, -2, -1, 0, 1, 2,…}
3/5
10.3
0.6
12/5
3.46466466646666…
√ 2
√ 3 are a few examples of real numbers.
Properties of Real Numbers Definition
Let’s define the properties of real numbers:
Closure Property
The product and sum of two real numbers is always another real number.
For all a, b ∈ R, a + b ∈ R, and ab ∈ R
Associative Property
The product or sum or any three real numbers remains the same no matter how you change
their grouping.
For all a,b,c ∈ R, a + (b + c) = (a + b) + c and a × (b × c) = (a × b) × c
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MTS | My Tutor Source | https://mytutorsource.com/
Commutative Property
The product or sum of two real numbers remains the same no matter how you interchange
their order.
For all a, b ∈ R, a + b = b + a and a × b = b × a
Distributive Property
The distributive property of multiplication over subtraction is a × (b – c) = (a × b) – (a × c)
while the distributive property of multiplication over addition is is a × (b + c) = (a × b) + (a
× c).
Number Line
A real number line lets you display real numbers on a line by linking them to unique points.
The real number linked to a point is known as a coordinate. While the point on the line
that is linked to a coordinate is known as its graph.
To draw a real number line, you need to draw a horizontal line that has arrows on its both
ends that indicate that the line continues without bound. Then choose a point to represent
the zero. That point will be called the origin.
Mark consistent intervals on both sides of the number zero (origin) and label every tick
mark (which represents one unit) to define your scale. Positive real numbers are always
written on the right of the origin and the negative real numbers are written on the left.
The origin is neither positive nor negative.
However, the scale doesn’t always have to be one unit. Every tick can represent two units
or more. The graph of each real number is represented as a dot on the number line.
Ordering Real Numbers
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MTS | My Tutor Source | https://mytutorsource.com/
When you’ve to order real numbers on a number line, make sure that you place the bigger
number to the right of the smaller number. For example, 20 is greater than 6, and -2 is
greater than -7.
Using Symbols
Symbols are used to effectively show the relationships between the numbers on the
number line. For instance:
= is equal to
≠ is not equal to
≈ is approximately equal to
These can be used in the following manner:
5 = 5
0 ≠ 5
π ≈ 3.145
Then come the symbols that represent an order relationship between real numbers, for
example:
< Less than
> Greater than
≤ Less than or equal to
≥ Greater than or equal to
These can be used in the following manner:
−120 is placed at the left of –10 on the real number line, so it means that −120 is less than
–10. You can write it as:
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−120 < −10
The symbols < and > are used to show strict inequalities, while the symbols ≤ and ≥ are
used to show inclusive inequalities. You can use more than one symbol in certain situations.
Remember that you can only use the word ‘or’ when one of the given conditions is true:
‘equal to’ or ‘less than’, for example.
An Example
Classify each given number as negative or positive and as either irrational or rational. Does
the given number lie to the right or the left of the zero on the number line?
ⓐ −103
ⓑ 5
ⓒ −289
ⓓ −6π
ⓔ 0.615384615384…
Solution
ⓐ −103 is rational, negative, and lies on the left of the zero.
ⓑ 5 is irrational, positive, and lies on the right of the zero.
ⓒ −289= −17. It’s rational, negative, and lies on the left of the zero.
ⓓ −6π is irrational, negative, and lies on the left of the zero.
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ⓔ 0.615384615384… is positive, rational, and lies on the right of the zero.
Is 7 a Real Number?
Yes, 7 is a real number. The number 7 belongs to the set of natural numbers that also come
under the real numbers.
Is Zero a Real or an Imaginary Number?
Zero is both a real number and an imaginary number. Imaginary numbers are basically the
square roots of non-positive real numbers. And because zero can also be considered a non-
positive number, hence, it completes the criteria used to determine an imaginary number.
On the other hand, zero is also a rational number because it can be defined on a number
line. Therefore, it’s a real number.
That’s all for your Algebra lesson about real numbers. Best of luck!