Vocabulary
What do you call a letter that represents a number?
Variable
Write the expression for “5 more than x.”
x + 5
Solve: x + 5 = 12
x = 7
Sarah has 3 times as many pencils as Tom. Tom has x pencils. Write an expression
3x
Is this an expression or equation: 5 + x
Expression
What is a mathematical sentence using an equals sign?
Equation
Simplify: 2 + 3x + 4
3x + 6
Solve: 3x = 18
x = 6
If a number plus 7 equals 20, what is the number?
13
True or False: 2x = x + x
True
What do you call a mathematical phrase with numbers, variables, and operations, but no equals sign?
Expression
What does 4(x + 2) mean?
4 times the sum of x and 2
What do you do to both sides to solve x/4 = 5?
Multiply both sides by 4
A pizza costs $5 more than a burger. If a burger is $x, what’s the cost of the pizza?
x + 5
What’s the inverse operation of multiplication?
Division
What is the answer to a multiplication problem called?
Product
Write an expression for “double the sum of a and b.”
2(a + b)
Solve: 2x + 3 = 11
x = 4
Sam read 12 pages a day. After x days, he read 96 pages. Write and solve an equation.
12x = 96 → x = 8
What operation helps isolate x in x - 6 = 10?
Add 6
What do you call a number by itself in an expression?
Constant
Simplify: 3(x + 4) + 2x
5x + 12
Solve: 4(x - 1) = 20
x = 6
Lisa buys 4 shirts. Each costs x dollars. She spends $80. What’s x?
4x = 80 → x = 20
Fill in the blank: 3(2x + 1) = ______
6x + 3