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Writing Variable Expressions
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Writing Variable Expressions
Write an expression for each situation. A variable can stand for an unknown amount or for any value in a stated set. Choose the best answer for each multiple-choice question.
Choose an Expression
Select one answer for each question.
1.Lucy has b baseball cards and gives 8 cards to a friend. Which expression represents the cards Lucy has now?
- b + 8
- b − 8
- 8 − b
- 8b
2.A game earns r points in each round. Which expression gives the points earned in 6 rounds?
- r + 6
- r − 6
- 6r
- r ÷ 6
3.Let k be any whole number from 2 through 9, including both endpoints. Which choices describe all possible values of k? Select every correct choice.
- 2 ≤ k ≤ 9
- k = 5
- k ∈ {2, 3, 4, 5, 6, 7, 8, 9}
- k > 1
4.A letter q stands for a number of books in a box, but the number has not been counted yet. What does q represent?
- A particular unknown number
- Every number in a stated set
- The number of dollars spent
- A number that must equal 4
Write and Explain
Use the variable named in each situation. Show an expression, not an equation.
5.A student earns p points on each quiz. Write an expression for the points earned on 5 quizzes.
6.A notebook costs $n, and a pen costs $3. Write an expression for the total cost of one notebook and one pen, using a dollar sign.
7.Isabella has c coins and finds 9 more. Write an expression for her new number of coins. Then explain whether c is an unknown number or any number in a specified set.
8.A number w can be any multiple of 3 from 3 through 15. Write an expression for 4 more than w.
Exit Check
Read the situation carefully and answer both questions.
9.A sunflower grows h inches each week. Write an expression for its growth over 7 weeks.
10.In the sunflower situation, h is not given a range of possible values. Does h stand for one unknown number or any number in a specified set? Explain briefly.
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