Task Teacher Guide
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In This Task…
Students will explore subtraction in a context by taking numbers away from ten. A connection can be made to the combinations that make ten.
Intentionality…
In this task, students will explore the combinations of ten through a subtraction focus. The relationship between addition and subtraction can be highlighted as students recognize that knowing the addition fact will assist with the subtraction fact.
Big ideas of the unit:
- Understanding hierarchical inclusion allows for flexible composing and decomposing of numbers
- Numbers can be decomposed by separating a whole into two or more parts
- Subtraction names the missing part in terms of the whole
- Different subtraction situations will elicit different strategies
- Number relationships provide the foundation for strategies to help students remember basic facts
- Addition and subtraction are related in that addition names the parts in the whole and subtraction uses the whole to find a missing part.
- Subtraction can be used in either take away, comparison, or missing addend situations.
Models can be used to connect concrete to abstract
Spark
What Do You Notice? What Do You Wonder?
Show students the following video:
Then, ask students:
What do you notice?
What do you wonder?
Give students 60 seconds (or more) to do a rapid write on a piece of paper.
Then, ask students to share with their neighbours for another 60 seconds.
Finally, allow students to share with the entire group.
Some of the noticing and wondering that came up in a class recently included:
- I notice there are trees
- I notice there are apples
- I notice there are 10 apples on the tree
- I wonder this is an apple orchard
- I wonder if we can eat the apples
Estimation: Prompt
Next, share the following visual prompt briefly and ask the following question:
Each tree in the orchard has a different amount of apples on it. Every tree has 10 or more apples. None of the trees have more than 20 apples. How many apples could be on the trees?
Estimation: Reveal
Sense Making
Crafting A Productive Struggle: Prompt
Since you have already taken some time to set the context for this problem and student curiosity is already sparked, we have them in a perfect spot to help push their thinking further and fuel sense making.
Share the following prompt.
One of the trees has 10 apples on it. The apple picker came and picked 6 apples.
How many apples are still on the tree?
During Moves
While Students Are Productively Struggling…
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Student Approach #1: Direct Modeling and Counting
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Student Approach #2: Using fingers to Count Back
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Student Approach #3: Known Addition Fact
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Next Moves
Consolidation: Making Connections
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Reveal
Reflect
Provide students an opportunity to reflect on their learning by offering these consolidation prompts to be completed independently.
Consolidation Prompt #1:
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Consolidation Prompt #2:
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We suggest collecting this reflection as an additional opportunity to engage in the formative assessment process to inform next steps for individual students as well as how the whole class will proceed.
Download Editable/Printable Handout
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Resources and Downloads
Lesson Tip Sheet
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Videos & Images
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Keynote Slides
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PowerPoint Slides
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Printable Handout
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Explore The Entire Unit of Study
This Make Math Moments Task was designed to spark curiosity for a multi-day unit of study with built in purposeful practice, and extensions to elicit and emerge mathematical models and strategies.
Click the links at the top of this task to head to the other related lessons created for this unit of study.
Consolidation Prompt #1
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Consolidation Prompt #2
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Download Editable/Printable Handout
Become a member to access purposeful practice to display via your projector/TV, download the PDF to upload to your LMS and/or print for students to have a physical copy