## ZEN ZEBRAS [DAY 2]

### ADDITION STRATEGY: BREAK APART ONE ADDEND

Dive into this 5-Day Problem Based Math Unit which focused on the efficient strategy of breaking apart one addend to add values within 50

#### Intentionality

#### Math Talk

#### Visual Math Talk Prompt #1

#### Visual Math Talk Prompt #2

#### Visual Math Talk Prompt #3

#### Visual Math Talk Prompt #4

#### Purposeful Practice

#### Resources & Downloads

#### Educator Discussion Area

## Intentionality & Unit Overview

### Length of Unit: 5 Days

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## Intentionality…

The purpose of the Day 2 activities is to reinforce key concepts from Day 1. Students will engage in a string of related problems through a math talk and will have an opportunity to complete purposeful practice. The math talk and purposeful practice serve to develop a deeper understanding of the following big ideas.

Some of the big ideas that may emerge today include:

- Understanding hierarchical inclusion allows for flexible composing and decomposing of numbers
- Numbers can be decomposed by separating a whole into two or more parts
- Addition names the whole in terms of the parts
- Different addition situations will elicit different strategies
- Number relationships provide the foundation for strategies to help students remember basic facts
- Models can be used to connect concrete to abstract

*Before starting this unit, students should be familiar with:*

- Facts of 10 ( e.g., 6 + 4 = 10, 10 – 4 = 6)
- Flexibility when decomposing numbers (e.g., 13 can be decomposed into 10 and 3, but also 9 and 4, 8 and 5, etc)

The Up and Over Ten strategy which can be explored in the Bowling Pins Unit.

## Math Talk

To practice decomposing one addend, have your students work through these problems one at a time. As you present each problem, provide students with some quiet, individual think time during which they can solve the problem and show their thinking on a dry erase board, paper, etc. Then have students share their thinking either in pairs or with the whole group. **As you facilitate these conversations, it will be important to highlight how flexibly decomposing the numbers makes addition easier.**

The number strings are created to lead students through the process of decomposing the numbers. The first 3 prompts have 3 parts to them. The last prompt is slightly more difficult but allows students an opportunity to apply their understanding.

**String 1:**

**24 + 6 **

**23 + 7 **

**23 + 9**

**String 2:**

**32 + 8 **

**35 + 7 **

**36 + 8 **

**String 3:**

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**String 4:**

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## Visual Math Talk Prompt #1

## Visual Math Talk Prompt #2

## Visual Math Talk Prompt #3

**Login/Join to access the entire Visual Prompt, downloadable slide decks and printable handouts for this lesson and all problem based units.**## Visual Math Talk Prompt #4

## Purposeful Practice

## Small Group Game

## Small Group Assessment Opportunity

## Resources & Downloads

#### Printable Lesson Plan PDF

#### Videos, Images & Media Files

#### Apple Keynote Presentation

#### Powerpoint Presentation

#### Printable Consolidation Prompts

## Educator Discussion Area

## Explore Our 60+ Problem Based Units

This Make Math Moments Lesson was designed to spark curiosity for a multi-day unit of study with built in purposeful practice, number talks and extensions to elicit and emerge strategies and mathematical models.

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