5th Grade Algebra Review! Variables.

Vocabulary

100

A letter used to represent a number is called a

variable

200

An expression which contains variables is called an

algebraic expression

300

When two expressions are compared using > or <, the whole statement is an

inequality

400

If two expressions have the same value, the whole statement is an

equation

500

To find the value of the variable that will make an equation true is to _____________ the equation.

solve

Write Expressions

100

Write the expression: Add 4 to x

x + 4

200

Write the expression: Subtract x from 8

8 - x

300

Write the expression: Multiply x by 7

7x

400

Write the expression: Divide x by 2

x /2

500

Write the expression: Subtract 7 from x and then divide by 3

x - 7 / 3

Where is the Variable

100

Where is the variable: 3y + 6 = 19

y 

200

Where is the variable: 2 + <3 = 5 

<3

300

Where is the variable: 30 - t = 20 + 10 

t 

400

Where is the variable: 4 / ? = 4 

? 

500

Where is the variable: 20 x ~ = 100

~ 

Write Equations

100

A box of cookies minus four cookies equals 22 cookies.

B - 4 = 22 

200

Daniel is saving money to buy a pair of skates. He has $70.00. The skates cost $150.00. Which equation could you use to find how much more Daniel needs to save?

A. $70.00 + $150.00 = s

B. $70.00 - $150.00 = s

C. $150.00 + $70.00 = s

D. $150.00 - $70.00 = s

D. $150.00 - $70.00 = s

300

Carrie is 10 years old. If y stands for the number of years from now, which expression tells how old Carrie will be at that time?

F. 10 - y 

G. 10 x y

H. 10 + y

J. y ÷ 10

H. 10 + y

400

One pizza serves 6 people. If p stands for the number of pizzas Sam bought for his party, which expression tells how many people were served?

A. 6 x p

B. p - 6

C. p ÷ 6 

D. p + 6

A. 6 x p 

500

Marie had five candy apples. Her mother surprised her by buying her some more at the local store. After her mother gave her the extra candy apples, she had a total of 10. How many candy apples did Marie’s mother buy?

5 + A = 10

Mystery

100

A box of cookies and four extra equals 30 cookies.

What operation is used in this? 

addition + 

200

A box of cookies and four extra equals 30 cookies.

What are the known numbers? 

4 and 30 

300

A box of cookies and four extra equals 30 cookies.

Write the open sentence for this using the variable

b + 4 = 30 

400

A full box shared among four people equals 6 cookies per person.

What is the operation to set this up? 

shared = division 

500

A full box shared among four people equals 6 cookies per person.

What is the open sentence representing this word problem?

f / 4 = 6