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Teachers — Training of
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Subtraction
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1.

Amazing Equations [electronic resource]

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Using the day of the month, first- and second-graders investigate the concepts of addition and subtraction as they share story problems that relate to the date. Teams use everyday language and experiences to connect to the mathematical language and symbolism for operations. Covers the following NCTM standards: concepts of whole number operations, whole number computation, communication, and connections.
Online
1997
2.

Window Puzzle [electronic resource]

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First-graders investigate number combinations by working with a window puzzle (a square divided into four equal squares). Students explore both addition and subtraction employing physical materials to aid in computation as well as using mental math. Covers the following NCTM standards: whole number computation, communication, reasoning.
Online
1997
3.

Bean Sprouts [electronic resource]

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Pairs of second-graders explore subtraction, based on the number of plants sprouting from the bean-seeds they have planted. The importance of context for student understanding, and various approaches to problem-solving, are exemplified. Covers the following NCTM Standards: concepts of whole number operations, reasoning, problem solving, communication.
Online
1997
4.

This Small House [electronic resource]

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Second- and third-graders use calculators, paper and pencil, and mental math within a realistic task. Students plan the decorating of their milk carton houses using spatial sense to select appropriate furnishings while staying within their allocated budget. Covers the following NCTM standards: whole number computation, geometry and spacial sense, connections, and communication.
Online
1997
5.

Meanings and Models for Operations [electronic resource]

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Examines the operations of addition, subtraction, multiplication, and division and their relationships to whole numbers. Works with area models for multiplication and division. Explores the use of two-color chips to model operations with positive and negative numbers.
Online
2003