PLENTIFUL POMEGRANATES [DAY 5]
SUBTRACTION STRATEGY: PLACE VALUE TO ALGORITHM
Explore efficient strategies to subtract values within 50
Intentionality
Math Talk
Visual Math Talk Prompt #1
Visual Math Talk Prompt #2
Visual Math Talk Prompt #3
Consideration
Assessment
Resources & Downloads
Educator Discussion Area
Intentionality & Unit Overview
Length of Unit: 5 Days
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Through This Assessment Opportunity…
Students will demonstrate the concepts and skills that they have developed in this unit.
The purpose of this assessment is for students to demonstrate their understanding of the following big ideas.
- Exchanging or regrouping occurs when the subtrahend in a place value is bigger than the minuend
- Number relationships provide the foundation for strategies to help students remember basic facts
- Subtraction of numbers within 50 by using a take away strategy: Place Value/ Algorithm
Students might write and/or model their responses independently. Students can also be interviewed by their teacher.
An alternative assessment opportunity should be offered if this tool will not successfully capture what the student knows, understands or can do.
Math Talk
In Day 4 of this unit, students were exposed to math talks related to subtracting when regrouping or exchanging is necessary. The number talks for Day 5 will provide more opportunities for students to practice the strategy of decomposing the subtrahend. The last prompt in the set pushes the strategy beyond 50 to give educators the opportunity to see if the students can extend their understanding.
The numbers in these prompts have been specifically chosen to be able to “catch” the reversal misconception.
For example:
VERSUS
Prompts:
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Visual Math Talk Prompt #1
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Visual Math Talk Prompt #2
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Visual Math Talk Prompt #3
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Consideration
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Assessment
Assessment Considerations…
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Assessment Opportunity: Independent
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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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