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Which direction do we subtract?

published by David Wees on Fri, 2018-02-02 16:28
Preview: 

This task helps build students' understanding of how subtraction can be represented on a number line and in particular that the order we subtract changes the answer.

Grade: 
Grade 7
Task Type: 
Connecting Representations
Source: 
David Wees
Links: 
Description of Connecting Representations
Slides Template
Planning Document
Big Idea: 
Grade 7: Computational fluency and flexibility with numbers extend to operations with integers and decimals.
Content: 
subtracting integers representing subtraction pictorially and symbolically
Curricular Competency: 
Reasoning and analyzing: Develop mental math strategies and abilities to make sense of quantities
Understanding and solving: Develop, demonstrate, and apply mathematical understanding through play, inquiry, and problem solving
Understanding and solving: Visualize to explore mathematical concepts
Understanding and solving: Develop and use multiple strategies to engage in problem solving
Communicating and representing: Communicate mathematical thinking in many ways
Communicating and representing: Use mathematical vocabulary and language to contribute to mathematical discussions
Communicating and representing: Explain and justify mathematical ideas and decisions
Communicating and representing: Represent mathematical ideas in concrete, pictorial, and symbolic forms
Connecting and reflecting: Reflect on mathematical thinking

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