Vocabulary
What do we call a letter that represents a number?
Variable
Write an expression: "5 more than a number x."
5 + x
Write an expression: "3 times a number x.
3x
Evaluate: 2x when x = 3.
6
Ben has x apples. He buys 5 more. Write an expression.
x+5
What is a number without a variable called?
Constant
Write an expression: "A number y decreased by 7.
y-7
Write an expression: "A number divided by 4.
x/4
Evaluate: x + 7 when x = 5.
12
Mia earns $10 per hour. Write an expression for how much she earns in h hours
10x
What is the mathematical phrase that contains numbers, variables, and operations but no equals sign?
Expression
Write an expression: "Twice a number plus 9."
2x+9
Write an expression: "The product of 6 and a number y, then subtract 2."
6y-2
Evaluate: 3x - 4 when x = 4
8
A box holds x pencils. There are 4 boxes. Write an expression for the total pencils.
4x
What is the number in front of a variable called?
Expression
"The sum of a number and 12, then subtract 4."
((x + 12) - 4)
Write an expression: "A number is doubled and divided by 5.
Evaluate: x² - x when x = 6
30
Sarah had 3 times as many marbles as Tom. Tom has t marbles. Write an expression.
3t
What do we call parts of an expression separated by + or − signs?
Terms
Write an expression: "15 less than the sum of a number and 6."
x+ 6 -15
Write an expression: "Triple a number, then divide the result by the sum of 2 and the number."
3x/ 2+x
(2x + 3) ÷ x when x = 3.
3
A farmer has x cows. Each cow gives 8 liters of milk per day. Write an expression for total milk in 5 days.
8x x 5