Writing Expressions
Write an expression for 7 more than a number x.
x+7
Solve: x + 9 = 16
x = 7
Simplify: 4x + 3x
7x
A movie ticket costs $8. Write an expression for the cost of x tickets.
8x
What is the largest animal currently living on Earth?
Blue whale
Write an expression for 4 times a number, decreased by 9.
4x − 9
Solve: 5x = 45
x = 9
Simplify: 8x + 5 − 3x + 2
5x + 7
A taxi charges $5 plus $3 per mile. Write an expression for the cost of m miles.
5 + 3m
How many hearts does an octopus have?
Three
Write an expression for half the sum of x and 12.
(x + 12)/2
Solve: 3x − 7 = 20
x = 9
Simplify: 3(x + 4)
3x + 12
Three friends split a $42 bill equally. How much does each pay?
$14
Which planet has the shortest day in our solar system?
Jupiter
Write an expression for 5 less than 3 times the difference between x and 4.
3(x − 4) − 5
Solve: 4(x + 2) = 36
x = 7
Simplify:
5(2x − 3) + 4x
14x − 15
A rectangle has a width of x and a length 5 more than its width. Write an expression for its perimeter.
4x + 10
What is the only mammal capable of true sustained flight?
Bat
A number x is doubled, then 7 is subtracted. The result is multiplied by 4. Write the expression.
4(2x − 7)
Solve: 5(2x − 3) = 3x + 20
x = 5
Simplify:
3(2x − 5) − 2(x + 7) + 8
4x − 21
A gym charges a $25 registration fee and $15 per month. If the total cost is $160, how many months did someone pay for?
9 months
What is the name of the deepest known point in Earth's oceans?
Challenger Deep (Mariana Trench)