Lessons Intro to Algebra Review

What are variables in math?

• Letters

• Numbers

• Expressions

5p + 4h - 2
Which are the variables? 

• 5p, 4h, 2
• 2
• p, h
• 5, 4

In this expression what is the variable? 
5 + y 

• q
• +
• 5
• y

A constant is . . .

• a letter

• a math or science mystery

• a number

• a variable

The number or constant in this is expression is ____ ? 
6 + n 

• n
• +
• 6
• =

Write the phrase as an expression.
twice a number x plus 8

• 2 + 8x
• 2x + 8
• 2(x+8)
• 8(2+x)

triple the sum of x and 5

• 3 + x + 5
• 3 ∙ x + 5
• 3(x + 5)
• (3x) + 5

2 times the sum of y and 5 

• 2 + y + 5
• 2y + 5 
• 2(y + 5)
• 2 - y + 5

Write the expression.
Twelve fewer questions than were on the first test. 

• 12 + q
• q - 12
• q x 12
• q ÷ 12

Write the expression. 
Five dollars less than Tim's pay. 

• p + 5
• p - 5
• 5p
• p ÷ 5