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ExponentsExponents- An introduction -
By Carol EdelsteinDavid E. Owens Middle School
New Milford, NJ
Location of an ExponentLocation of an Exponent
An exponent is a number high and An exponent is a number high and to the right of a base number.to the right of a base number.
3 4 Base
Exponent
Definition of ExponentDefinition of Exponent An exponent tells you how many times An exponent tells you how many times
the base number is multiplied by itself. the base number is multiplied by itself.
34
BaseExponent
So, 3So, 344 is equal to 3 x 3 x 3 x is equal to 3 x 3 x 3 x 3. 3.
How to read an ExponentHow to read an Exponent
This exponent is read “three to This exponent is read “three to the fourth power”the fourth power”..
34
This exponent is read “two to This exponent is read “two to the sixth power”the sixth power”..
26
How to read an Exponent How to read an Exponent (the special cases)(the special cases)
This exponent is read “seven to the This exponent is read “seven to the second power”second power” or or “seven squared”“seven squared”..
7 2
This exponent is read “eight to the This exponent is read “eight to the third power”third power” or or “eight cubed”“eight cubed”..
83
Practice – Practice – Read These ExponentsRead These Exponents
3 2 6 72 3 5 4
Did you get…Did you get…
3 2 6 72 3 5 4
Two to the third power Seven to the fourth power
or Two cubed
Three to the second power
or Three squared Six to the fifth power
What is the Exponent?What is the Exponent?
2 x 2 x 2 = 23
What is the Exponent?What is the Exponent?
3 x 3 = 3 2
What is the Exponent?What is the Exponent?
5 x 5 x 5 x 5 = 54
What is the Base and What is the Base and the Exponent?the Exponent?
8 x 8 x 8 x 8 = 8 4
What is the Base and What is the Base and the Exponent?the Exponent?
7 x 7 x 7 x 7 x 7 =7 5
What is the Base and What is the Base and the Exponent?the Exponent?
9 x 9 = 9 2
How to multiply out an How to multiply out an Exponent to find theExponent to find the
Standard FormStandard Form
= 3 x 3 x 3 x 33
927
81
4
4 2= 16
4 x 4 = 16
Write the Power in Write the Power in Standard FormStandard Form
Make sure that you do
not read this question as 4 x 2.
Write the Power in Write the Power in Standard FormStandard Form
2 3= 8
2 x 2 x 2 =
4 x 2 = 8
How did you do?
3 2= 9
3 x 3 = 9
Write the Power in Write the Power in Standard FormStandard Form
Again, make sure that you
do not read this question as 3 x 2.
5 4= 625
5 x 5 x 5 x5 =
25 x 5 x 5 =
125 x 5 = 625
Write the Power in Write the Power in Standard FormStandard Form
Exponents used inExponents used inArea ProblemsArea Problems
Area = length x width
Length = 30 ft Width = 15 ft
Area = 30 ft x 15ft = 450 ft 2
15ft
30ft
Remember: ft 2 = ft x ft
Exponents are used Exponents are used inin
Volume ProblemsVolume ProblemsVolume = length x width x height
length = 10 cm width = 10 cm height = 20 cm
Volume = 20 cm x 10 cm x 10 cm = 2,000 cm 3
10cm10cm
20cm
Remember: cm3 = cm x cm x cm
Exponents are also Exponents are also used…used…
in in scientific notationscientific notation to express very to express very large large oror small numbers. small numbers.
Example:Example:
The distance to the sun is about 90,000,000 The distance to the sun is about 90,000,000 miles. miles.
Using scientific notation, we can write this Using scientific notation, we can write this number. number.
90,000,000 = 9 x 10 x 10 x 10 x 10 x 10 x 10 x 90,000,000 = 9 x 10 x 10 x 10 x 10 x 10 x 10 x 1010
9 x 10 9 x 10 77
Scientific notation
The EndThe End
Congratulations, now you know a little more about exponents.