CARD TRICKS [DAY 4]
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
Visual Math Talk Prompt #5
Purposeful Practice
Resources & Downloads
Educator Discussion Area
Intentionality & Unit Overview
Length of Unit: 5 Days
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Students will deepen their understanding of working with the numbers presented when they are adding. The numbers have been specifically chosen to elicit the Add Extra and Adjust addition strategy.Â
Intentionality…
The purpose of the Day 4 activities is to reinforce key concepts from Day 3. 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 partsÂ
- Different addition situations will elicit different strategiesÂ
- 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 numbersÂ
- Subtracting near numbers
Math Talk
To deepen the understanding of addition by thinking about the addends presented, 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, emphasize that the Add Extra and Adjust strategy is efficient because one addend is just under the decade.
The problems are supporting the move towards adding numbers mentally and creating number sense. Students should be encouraged to do parts of the addition in their head. For this purpose students need to develop a mental number line.Â
The last two prompts are stand alone without the rounded addend given. Can students round to the appropriate number on their own?
String 1:
23 + 10
23 + 9
String 2:
36 + 10
36 + 9
String 3:
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String 4:
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String 5:
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Visual Math Talk Prompt #1
Facilitator Note:
The string leads students to realize that they can use their understanding of adding 10 to help with adding 9. Since 10 is one higher than 9, one more has been added. To adjust for this, students need to subtract one.Â
23 + 10 = 33 therefore 23 + 9 is one less than 33. The answer is 32. Visual Math Talk Prompt #2
Visual Math Talk Prompt #3
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Visual Math Talk Prompt #4
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Visual Math Talk Prompt #5
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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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