Algebraic Expression Ppt

8/6/2019 Algebraic Expression Ppt

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ObjectiveThe student will be able to:

translate verbal expressions intomath expressions and vice versa.

SOL: A.2

Designed by Skip Tyler, Varina High School


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What is the area of a rectangle?

Length times Width

If the length is 3 meters and the width is 2

meters, what is the area?A = L x W

A = 3 x 2 = 6 meters2

A, L and W are the variables. It is anyletter that represents an unknown number.


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An algebraic expression

contains:

1) one or more numbers or variables, and

2) one or more arithmetic operations.Examples:

x - 3

3 2n


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In expressions, there are many

different ways to write multiplication.

1) ab

2)

a b

3) a(b) or (a)b

4) (a)(b)

5) a x bWe are not going to use the multiplication symbol

any more. Why?


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Division, on the other hand, is

written as:

1)

2) x 3


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Throughout this year, you will hear many

words that mean addition, subtraction,multiplication, and division. Complete the

table with as many as you know.


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Here are some phrases you may have listed.

The terms with * are ones that are often

used.


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Write an algebraic expression for

1) m increased by 5.

m + 5

2) 7 times the product ofx and t.

7xt or 7(x)(t) or 7 x t


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3) 11 less than 4 times a number.4n - 11

4) two more than 6 times a number.

6n + 25) the quotient of a number and 12.


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Which of the following expressions represents

7 times a number decreased by 13?1. 7x + 132. 7x - 133. 13 - 7x4. 13 + 7x

Answer Now


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Which one of the following expressions

represents 28 less than three times a number?1. 28 - 3x2. 3x - 283. 28 + 3x4. 3x + 28

Answer Now


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Write a verbal expression for:

1) 8 + a.

The ratio ofm to rDo you have a different way of writing

these?

The sum of 8 and a

2)


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Which of the following verbal expressions

represents 2x + 9?

Answer Now

1. 9 increased by twice a number2. a number increased by nine3.

twice a number decreased by 9

4. 9 less than twice a number


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Which of the following expressions represents

the sum of 16 and five times a number?

Answer Now

1. 5x - 162. 16x + 53. 16 + 5x4. 16 - 5x


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base

and 3 is called the

exponentor power.

103 means 10 10 10103 = 1000

When looking at the expression103, 10 is called the


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How is it said?

21

Two to the first power

22

Two to the second power or two squared23

Two to the third power or two cubed

2n7

Two times n to the seventh power


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Which of the following verbal expressions

represents x2 + 2x?

Answer Now

1. the sum of a number squared andtwice a number

2. the sum of a number and twice thenumber

3. twice a number less than the numbersquared

4. the sum of a number and twice thenumber squared


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Which of the following expressions

represents four less than the cube of a

number?

Answer Now

1. 4 x32. 4 3x3. 3x 44. x3 4


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Evaluate.

21

2

22

2 2 = 423

2 2 2 = 8

2n7

We cant evaluate because we dont

know what n equals to!!


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Is 35 the same as 53?

Evaluate each and find out!

35 = 3 3 3 3 3 = 243

53 = 5 5 5 = 125

243 125

They are not the same!

http://teachers.henrico.k12.va.us/math/hcpsalgebra1/module1-1.html

Algebraic Expression Ppt

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