3 n + 7 3n+7 3 n + 7 Where n = − 2 n=-2 n = − 2 Show the substitution value.

3 ⋅ − 2 + 7 3\cdot-2+7 3 ⋅ − 2 + 7

3 ⋅ 7 + ( − 2 ) 3\cdot7+\left(-2\right) 3 ⋅ 7 + ( − 2 )

State the terms: x 2 + 3 z − 6 \frac{x}{2}+3z-6 2 x + 3 z − 6

x 2 , 3 z , − 6 \frac{x}{2},\ 3z,\ -6 2 x , 3 z , − 6

x 2 , 3 z , 6 \frac{x}{2},\ 3z,\ 6 2 x , 3 z , 6

x , 2 , 3 z , 6 x,\ 2,\ 3z,\ 6 x , 2 , 3 z , 6

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Variables And Expressions

Variables and Expressions

Presentation

•

Mathematics

•

7th Grade

•

Practice Problem

•

Medium

•

CCSS

6.EE.A.2B, 7.EE.A.1, 6.EE.A.2C

Standards-aligned

Chatara Maxwell

Used 23+ times

FREE Resource

14 Slides • 10 Questions

Variables and Expressions

7.EE.2

Variable

is a letter that represents a number (or quantity) that is either unknown or is changing (variable).

-Example: x,a,.....

Expression

is a combination of variables and normal numbers using operations such as addition, subtraction, multiplication, division, and exponentation.
-Example: 4x+3, 5a-4, 3a,

\frac{27a}{3}

.......

Multiple Choice

$3n+7$ Given the expression. What should we do 1st?

add 7 first

multiply n by 3?

Multiple Choice

$3n+7$ Where $n=-2$ Show the substitution value.

$3\cdot-2+7$

$3\cdot7+\left(-2\right)$

Multiple Choice

$3\left(-2\right)+7=$

-1

-13

P.E.M.D.A.S

Parentheses or grouped together (such as in a numerator or denominator)
Exponentiation
Multiplication/Division (from left to right)
Addition/Subtraction (from left to right)

Evaluate the expression

$5x+2y-7z$

x=2, y=10, z=5

$5\left(2\right)+2\left(10\right)-7\left(5\right)$

10+20-35=

$30-35=$
$=-5$

Which operation did you do first?

Which did you do last?

Terms:A combination of variables and numbers using multiplication or division. They are separated from other terms by addition and subtraction.

Ex: 5x+2y-7z

$4x^2+7$ State all terms:

Terms $4x^2,7$

$12x+2y-11$ State the terms.

$12x,\ 2y,\ -11$
Don't forget the negative sign.

Multiple Choice

$x^2-\ y^2$ State the terms:

1, 1

$x^2,\ -y^2$

Multiple Choice

State the terms: $\frac{x}{2}+3z-6$

\frac{x}{2},\ 3z,\ 6

$\frac{x}{2},\ 3z,\ -6$

$x,\ 2,\ 3z,\ 6$

Poll

$3y^2-2xy+x^2$

State the terms.

$3y^2,\ -2xy,\ x^2$

Poll

$4x^3-2x^2+7x+10$

State the terms.

$4x^3,\ -2x^2,\ 7x,\ 10$

$4x^3,\ 2x^2,\ 7x,\ 10$

Monomial: An algebraic expression consisting of a single term.

Example. 5x

Multiple Select

Select the monomial

5x+4

$5c$

Binomial: an algebraic expression with exactly two terms.

Bi=2

Example 2x+10

Multiple Select

Choose all Binomials

5x+4-3

4x-3

5y+4z

Trinomial: An algebraic expression with exactly three terms.

Tri=3

Example 3x+2y-7

Multiple Select

Choose the trinomial:

\frac{1}{2}x-3

$4c^2+2c-5$

Complete a-f on your notes and submit them as proof of your learning.

Homework will be posted.

Variables and Expressions

7.EE.2

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