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Exponents & Powers Class 8 PPT

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 Page 2


Exponents
?
3
5
base
exponent
33
 means that  is the exponential
form of t
Example: 
he number
125 5 5
 . 125
?
5
3
means 3 factors of 5  or 5 x 5 x 5
Power
Page 3


Exponents
?
3
5
base
exponent
33
 means that  is the exponential
form of t
Example: 
he number
125 5 5
 . 125
?
5
3
means 3 factors of 5  or 5 x 5 x 5
Power
The Laws of Exponents:
#1: Exponential form: The exponent of a power indicates 
how many times the base multiplies itself.
3
Example: 5 5 5 5 ? ? ?
n factors of x
Page 4


Exponents
?
3
5
base
exponent
33
 means that  is the exponential
form of t
Example: 
he number
125 5 5
 . 125
?
5
3
means 3 factors of 5  or 5 x 5 x 5
Power
The Laws of Exponents:
#1: Exponential form: The exponent of a power indicates 
how many times the base multiplies itself.
3
Example: 5 5 5 5 ? ? ?
n factors of x
#2: Multiplying Powers: If you are multiplying Powers 
with the same base, KEEP the BASE & ADD the EXPONENTS!
m n m n
x x x
?
??
So, I get it! 
When you 
multiply 
Powers, you 
add the 
exponents!
512
2 2 2 2
9 3 6 3 6
?
? ? ?
?
Page 5


Exponents
?
3
5
base
exponent
33
 means that  is the exponential
form of t
Example: 
he number
125 5 5
 . 125
?
5
3
means 3 factors of 5  or 5 x 5 x 5
Power
The Laws of Exponents:
#1: Exponential form: The exponent of a power indicates 
how many times the base multiplies itself.
3
Example: 5 5 5 5 ? ? ?
n factors of x
#2: Multiplying Powers: If you are multiplying Powers 
with the same base, KEEP the BASE & ADD the EXPONENTS!
m n m n
x x x
?
??
So, I get it! 
When you 
multiply 
Powers, you 
add the 
exponents!
512
2 2 2 2
9 3 6 3 6
?
? ? ?
?
#3: Dividing Powers: When dividing Powers with the 
same base, KEEP the BASE & SUBTRACT the EXPONENTS!
m
m n m n
n
x
x x x
x
?
? ? ?
So, I get it! 
When you 
divide 
Powers, you 
subtract the 
exponents!
16
2 2
2
2
4 2 6
2
6
?
? ?
?
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FAQs on Exponents & Powers Class 8 PPT

1. What is an exponent in mathematics?
An exponent in mathematics is a number that indicates how many times a base number should be multiplied by itself. It is usually written as a superscript to the right of the base number. For example, in the expression 2^3, the base number is 2 and the exponent is 3. It means that 2 should be multiplied by itself 3 times, resulting in 2 x 2 x 2 = 8.
2. How do exponents simplify calculations?
Exponents simplify calculations by representing repeated multiplication in a concise way. Instead of writing out the product of the base number multiple times, we can use exponents to signify the repetition. For example, 2^4 is a shorthand notation for 2 x 2 x 2 x 2. This simplifies calculations and makes them easier to work with, especially when dealing with large numbers.
3. What are the rules for multiplying and dividing numbers with exponents?
When multiplying numbers with exponents, we can add the exponents if the base numbers are the same. For example, (2^3) x (2^2) = 2^(3+2) = 2^5. When dividing numbers with exponents, we can subtract the exponent of the denominator from the exponent of the numerator if the base numbers are the same. For example, (2^5) / (2^2) = 2^(5-2) = 2^3.
4. How do exponents relate to powers?
Exponents and powers are closely related. An exponent is the superscript number that indicates how many times a base number should be multiplied by itself. A power, on the other hand, is the result of raising a base number to an exponent. For example, in the expression 2^3, the base number is 2 and the exponent is 3. The power is the value obtained by multiplying 2 by itself 3 times, which is 8.
5. Can exponents be negative or fractional?
Yes, exponents can be negative or fractional. A negative exponent indicates the reciprocal of the base number raised to the positive exponent. For example, 2^-3 is equal to 1 / (2^3) = 1 / (2 x 2 x 2) = 1/8. A fractional exponent represents the root of the base number raised to the numerator and the denominator of the fractional exponent. For example, 4^(1/2) is equal to the square root of 4, which is 2.
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