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
The number line is a good visual to demonstrate this strategy. Once students have the ability to “see” their thinking in action, it will help with articulation of the process as well as a visual to explain to students that are not developed the understanding of the strategy.
Visual Math Talk Prompt #2
Visual Math Talk Prompt #3
Visual Math Talk Prompt #4
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Purposeful Practice
Small Group Game
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Small Group Assessment Opportunity
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Resources & Downloads
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Printable Lesson Plan PDF
Videos, Images & Media Files
Apple Keynote Presentation
Powerpoint Presentation
Printable Consolidation Prompts
Educator Discussion Area
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