Task Teacher Guide

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

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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.

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Math Talk

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Purposeful Practice

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[accordion-item title=”Questions: Partitive Division”]

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Resources and Downloads

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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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