Task Teacher Guide
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In This Purposeful Practice…
Students will explore the place value strategy of subtracting in parts from a multiple of ten minuend.
Intentionality…
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Math Talk
Related String of Problems
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Purposeful Practice
While Students Are Practicing…
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Questions: Subtracting Within 100
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Closest to Zero is a game that practices subtracting using a place value strategy.
While your students play or during a wrap discussion, the central point to talk about is how when we are subtracting 26, we can do that by first subtracting 2 tens and then subtracting 6 ones. Some students may subtract the ones before the tens which is also fine.
Another interesting point to discuss is how students handle a situation such as 72-18 or 64-19, where the subtrahend has more ones than the minuend. So they break up the ones to stop at a multiple of ten? Do they subtract all of the ones at once?
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.
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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.
Number Talk Prompt #1
100 – 10
Number Talk Prompt #2
90 – 3
Number Talk Prompt #3
100 – 13
Number Talk Prompt #4
100 – 20
Number Talk Prompt #5
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Number Talk Prompt #6
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Number Talk Prompt #7
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Number Talk Prompt #8
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Question #1
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Question #2
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Question #3
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Question #4
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Question #5
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Download Editable/Printable Handout
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