# Closure - Part C

## closure - part c

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Jacob Disston and his students share their insights into the day's lesson and reflect on what they learned.

## closure - part c

7th Grade Math - Algebraic Equations, Inequalities, & Properties
Jacob Disston, Willard Middle School, Berkeley Unified School District, Berkeley, California

Next Up:   Closure - Part D
Previous:  Closure - Part B

JACOB DISSTON: I want to very quickly...you know what? Here's what I want to do...you guys have all either talked about equations and inequalities or inequalities and expressions, so what I'm going to do is give you some index cards and the last part that I want you to do here on this activity is to make up six examples. So turn your papers to the back side. Number three says you have to make up six examples. You guys have to make up six examples, new examples. They can't be ones that are already on the board that fit, that are either equations, inequalities or expressions and fit the different subcategories that you came up with. Here we got properties and solving for unknowns. Here we didn't hear from it but people in groups came up with different categories. Can anybody name the categories they came up with within inequalities just so we can get some ideas?

STUDENT: The greater than and less than sign you can place them on a number line but they can't be a solution itself because they're not an equal to sign either. The greater than and less than equal to sign...

JACOB DISSTON: So these ones and these ones.

STUDENT: Yes, the ones that are like the alligator thing can't be a solution but the other ones can.

JACOB DISSTON: Okay, I heard what you guys were saying and that may or may not make sense to some people but what I want to show is that there are subcategories of inequalities; different types. So when you make up six you could make up some of these and some of these. What are the different types of expressions that people found? Does anybody have a name for the different categories of expression? Did anybody do expressions? I know you guys did. Give me a name for the different types of expressions.

STUDENT: We didn't really have names; we just sorted them into groups.

JACOB DISSTON: How would you describe the two groups?

STUDENT: One of them would be combining like terms I guess.

JACOB DISSTON: So like terms can be combined and what was the other group?

STUDENT: We didn't really make groups.

JACOB DISSTON: You said you sorted them into two groups.

STUDENT: Yes but we didn't name groups.

JACOB DISSTON: If this is the group that can be combined what is the other group?

STUDENT: Can't be combined.

JACOB DISSTON: Yes, it's the ones that you can't do anything to the expression. So, on your paper I want you and your group to make up six new examples. When you started that I'll give you the index cards.

STUDENT: Anyone?

JACOB DISSTON: Yes, six to fit any of those categories.

STUDENT: You have put them all together?

JACOB DISSTON: No, six.

STUDENT: You have to do six in each category.

JACOB DISSTON: No, six all together. Make up one of these, one of these...two, two, you decide. On here you got to make new examples that would fit within your groups that you listed here.

STUDENT: I'm looking at the ideas.

JACOB DISSTON: Good. Make up some new examples that'll fit within your subcategories and tell me what subcategories it is. Make up some new examples. Whatever variables you want, whatever numbers you want. Make up some new examples that would fit if I put them up on the board we could sort them.

STUDENT: We can do 17-2x=13 (inaudible)

STUDENT: Combining like terms. 2y+3y=5y.

STUDENT: No, we can do 2y plus 13...

STUDENT: Don't start.

STUDENT: 2y+11y= 15y

COMMENTARY BY COACH LINDA FISHER: During the closure, Jake spends time discussing various ways that groups sorted equations. This part seemed like an opportunity to make all the knowledge or thinking from the groups public. It also honored the idea that there could be different categories. Once the equations were discussed, he didn’t choose to delve into the categories for the other two groups. Is it always necessary to have a group discussion about everything? Why or why not?

As I watch the lesson, I see that there are several built in places for assessment. In the first problem, students are given chances to write about their thinking so far (See the student artifacts – questions 1 and 2.) In the lesson closure, students are assessed by being asked to create new examples. Why is this a significant process for assessment? What does it tell you about how students are learning?