CARD TRICKS [DAY 2]
ADDITION STRATEGY: ADD EXTRA AND ADJUST
Dive into this 5-Day Problem Based Math Unit which focused on the efficient strategy of adding extra and adjusting using numbers 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 through this task 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:
- Rounding numbers
- Adding decade numbers
- Subtracting near numbers
Math Talk
To practice adding extra and adjusting, 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.
The number strings are created to lead students through the idea of adding off the decade number and then connecting to the strategy Add Extra and Adjust.
String 1:
27 + 10
37 + 10
45 + 10
String 2:
34 + 20
56 + 20
45 + 30
String 3:
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String 4:
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Visual Math Talk Prompt #1
Show students the following visual math talk prompt and be prepared to pause the video where indicated. The numbers in the strings are purposefully chosen to “string” the students along to make the connection between adding off the decade and rounding an addend.
Facilitator Note:
We want students to mentally add 10 rather than having to track on their fingers. Students may have to track initially but be very explicit about what is happening in the tens column when 10 is added.
Visual Math Talk Prompt #2
Similar to the first prompt, this string is purposefully crafted so that students practice adding off the decade and recognize the ease of doing that mentally.
Visual Math Talk Prompt #3
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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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