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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.

Domino Math [electronic resource]

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First- and second-graders investigate number relationships and explore the concept of addition in a part-whole model using dominoes. They develop mathematical communication as they represent mathematical ideas with physical materials, words, diagrams, and symbols. Covers the following NCTM standards: concepts of whole number operations, whole number computation, problem solving, and communication.
Online
1997
3.

Marshmallows [electronic resource]

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Second-graders create and discuss a bar graph based on the number of marshmallows they estimate each person in their class would eat on a camping trip. After discussing their results, students determine how many bags of marshmallows to take. Covers the following NCTM standards: concepts of whole number operations, statistics and probability, reasoning, and problem solving.
Online
1997
4.

Dino Math [electronic resource]

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Kindergarteners team up in buddy pairs to explore addition combinations using a "dinosaur math" mat. They work with basic addition facts and use a part-whole concept to perform the addition. Covers the following NCTM standards: whole number computation, number sense and numeration, and communication.
Online
1997
5.

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
6.

Wheel Problem [electronic resource]

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First-graders are asked how many vehicles could be in a parking lot if the total number of wheels is 24. Students review each step of the problem-solving process before they decide on which materials to use and develop strategies. Covers the following NCTM standards: whole number computation, concepts of whole number operations, problem solving, and communication.
Online
1997
7.

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
8.

Arrays and Fractions [electronic resource]

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A first- through third-grade class investigates fractional parts of a set by building arrays that represent wholes of different sizes. In their task they use mathematical language and symbols and form mathematical connections among concepts of addition, area, multiplication, division, and fractions. Covers the following NCTM standards: fractions and decimals, number sense and numeration, reasoning, and communication.
Online
1997
9.

Story-Based Centers [electronic resource]

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Second-graders work at learning centers around their classroom that are based on the story "Caps for Sale." At the centers students construct graphs, figure out coin combinations to equal 50 cents, use a computer to explore patterns, and write story problems and number sentences. Covers the following NCTM standards: patterns and relationships, whole number computation, connections, and communications.
Online
1997
10.

Products and Sums [electronic resource]

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Exploring relationships between addition and multiplication, fourth-graders represent numbers, sums, and products with symbols and with geometric patterns on paper. Covers the following NCTM standards: patterns and relationships, number sense and numeration, reasoning, and communication.
Online
1997
11.

How Many People Will Fit? [electronic resource]

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First-graders investigate the concept of area by figuring out how many people will fit in four different areas in the school building. They organize and record solutions and use measuring, counting, and addition to find the total number of people. Covers the following NCTM standards: estimation, measurement, reasoning, and problem solving.
Online
1997
12.

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