## Task Teacher Guide

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### In This Purposeful Practice…

Students will leverage the money model to subtract decimals using different subtraction structures.

### Intentionality…

The purpose of the Day 2 activities is to reinforce key concepts from Day 1. Students will engage in a string of related problems through a math talk and will have an opportunity to complete independent purposeful practice. Today’s activities should be completed without the use of a calculator. The math talk and purposeful practice serve to develop a deeper understanding of the following * big ideas*.

- Fractions can be represented in a variety of ways;
- Fractions (and their decimal representation) represent values relative to a whole (for example, one whole dollar);
- Quantities represented as a decimal are fractions limited to base ten denominators (i.e.: tenths, hundredths, thousandths, etc.);
- Standard representation of coin values are expressed as decimal hundredths;
- Missing subtrahend is one structure of subtraction; it can be modelled on a number line;
- Missing subtrahends can be revealed by counting on or through a part-part whole model;
- The missing subtrahend subtraction structure is active subtraction (as opposed to passive);
- A variable can represent an unknown or changing quantity;
- Removal subtraction is active, while comparison subtraction is passive.

## Math Talk

### Related String of Problems

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## Purposeful Practice

### While Students Are Practicing…

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### Questions: Partitive Division

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## Resources and Downloads

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## Lesson Tip Sheet

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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.

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### Find the missing value…

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### 1. Consider the…

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### 2. Rowan has…

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### 3. Consider the…

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### 4. Llewyn has…

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### 5. Model and solve…

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