## Explaining the Thinking - Section 1: Explaining the Thinking

*Explaining the Thinking*

*Explaining the Thinking*

# Assessment

Lesson 9 of 10

## Objective: SWBAT demonstrate their understanding of larger numbers by using place value strategies to solve problems

## Big Idea: Assessment provides us with a chance to see what children understand and what they still need to work on.

*45 minutes*

#### Explaining the Thinking

*15 min*

I ask students to think back to the monsters that we made and counted the perimeter of several days ago. I bring out a pair of monsters (with perimeters already written on them) and ask students to find the difference between the perimeter of 2 of the monsters. I tell them that they should think of a number sentence to express the problem and then solve their number sentence. I give students several minutes to write an equation and try to solve it.

Next I ask for a volunteer to show us how they figured out the difference between the two perimeters.

I repeat the process with 2 other sets of monster perimeters. I walk around the room to see how students are comparing the monsters. I am looking at strategies, and also if students understand what it means to compare two numbers.

#### Resources

*expand content*

#### Assessing The Unit

*30 min*

Students are given a paper and pencil assessment of the uses of place value to solve 2- and 3-digit addition and subtraction problems. The questions are created to assess 2NBT A.3, B.6 and B.9.

They work independently to solve the problems. The problems include using the ten frames, expanded form, and their choice of strategies to solve the word problems.

The purpose of the assessment is to see which students need additional help in the use of place value strategies.

#### Resources

*expand content*

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- UNIT 1: What and Where is Math?
- UNIT 2: Adding and Subtracting the Basics
- UNIT 3: Sensible Numbers
- UNIT 4: Sensible Numbers
- UNIT 5: Everything In Its Place
- UNIT 6: Everything in Its Place
- UNIT 7: Place Value
- UNIT 8: Numbers Have Patterns
- UNIT 9: Fractions
- UNIT 10: Money
- UNIT 11: The Numbers Are Getting Bigger
- UNIT 12: More Complex Numbers and Operations
- UNIT 13: Area, Perimeter and More Measurement
- UNIT 14: Length
- UNIT 15: Geometry
- UNIT 16: Getting Ready to Multiply
- UNIT 17: Getting Better at Addition and Subtraction
- UNIT 18: Strategies That Work

- LESSON 1: Where Are Our Understandings
- LESSON 2: Students As Teachers
- LESSON 3: Students as Teachers Part II
- LESSON 4: Kindness Day Math
- LESSON 5: Manipulation Central
- LESSON 6: More Than One Way to Solve A Problem
- LESSON 7: How Big Is One Thousand
- LESSON 8: Let's Compare
- LESSON 9: Assessment
- LESSON 10: Missing Numbers in Japanese