1. Expressions Objective: Students will write numerical and algebraic expressions.

2. Vocabulary Review Variable Expression Equation Evaluate n + 7 = 10 c tsn r – 3, for r = 5 8p

3. Operation Verbal Expressions add plus sum more than increased by subtract minus difference less than decreased by take away less Operation Verbal Expressions÷ times multiplied by product divided into divided by quotient each more than

4. Warm Up: On your whiteboard, write a numerical expression. 5 more than 3 3 + 5 3 less than 5 5 - 3 the product of 6 and 7 6 x 7 the quotient of 12 and 3 12 ÷ 3

5. I Do It Rob and Jennifer both collect basketball cards. Rob has collected 27 cards. Rob has 3 times as many as Jennifer. Write an expression to show the number of cards Jennifer has. Understand (What is being asked?)Plan (Which operation(s) will you use?) Justify (I chose to use _____ because _____. ) Write (What is your expression?) Understand JustifyWrite Plan

6. I Do It Bob paid $3 for breakfast and $5 for lunch, then bought dinner. Write an expression to show how much money Bob spent on meals for the day.

7. We Do It Fred had 22 colored pencils. He lost some. Write an expression to represent how many pencils Fred has left. UnderstandPlan WriteJustify

8. We Do It Fred had some colored pencils. He lost 22. Write an expression to show how many colored pencils Fred has left. UnderstandPlan WriteJustify

9. We Do It Kenny had many baseball cards. He gave each of his 3 friends 8 cards. Write an expression to show how many cards he has left. UnderstandPlan WriteJustify

10. You Do It When the train stopped, 5 people boarded and two got off. Write an expression that represents how many people are left on the train. UnderstandPlan WriteJustify

11. You Do It Nick had some model airplanes. His sister broke 15. Write an expression that represents how many model airplanes Nick has left.

12. You Do It Nick had 15 model airplanes. His sister broke some. Write an expression that represents how many model airplanes Nick has left.

13. You Do It Debbie put her collection of 120 shells equally into boxes. Write an expression that represents how many shells are in each box.

14. You Do It Susan had 4 boxes and put some books in each box. Write an expression that shows how many books Susan has.

15. Card Activity Find matches for your expressions. – You should have a word problem, a written expression, and a mathematical expression in your group. – Check with your group members to make sure you all agree. – Be prepared to share with the class.

16. Challenge Question Yosemite National Park was created by Congress in 1890. The expression x – 1890 models the current age of the park in years. What does x represent?

17. Begin Grouping Examples I had 14 pretzels. I ate some and gave 3 to Mia.

18. Al planted 16 rose bushes. Then he bought some more.

19. Alejandro had a cat. It had kittens.

20. A platypus can stay under water for 10 minutes. If a polar bear can stay under water for 8 minutes less, write an expression to show how long a polar bear can stay under water?

21. Alice scored 3 goals in each soccer game. There were several soccer games. Write an expression to show how many goals she scored.

22. Mark has 24 apples. He wants to share them equally among his 4 friends.

23. Peter walked 12 miles in 3 hours. Write an expression to show how far Peter walked each hour.

24. Some girls came to the first practice. 12 more came to the second practice.

25. 359 more than z

26. The temperature dropped 10 degrees, then went up 4 degrees.

27. In the past year, Jack doubled his collection of origami paper shapes. He now has a total of 568 origami shapes. Write an expression to show how many origami shapes he had a year ago.