# Math

Math (X) - Professional (X) - Primary (X) - Mathematics (X)

## Building Deeper Understanding of Decimal Numbers

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Steve Hinds demonstrates how a brief discussion of money and decimals can help students to shed common misconceptions about decimal place value. (Click here for the background essay.)

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Steve Hinds demonstrates and discusses how teachers can successfully and gradually move from informal to more formal representations of functions. (Click here for the background essay.)

## Geometry and Spatial Relations: It's a Perfect Fit (Part 2)

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In this resource group, teachers can focus on the topic of geometry and spatial relations by having students identify and describe numerical relationships found among pattern block shapes. Students learn to join pattern block pieces together to cover a region. This resource group is part of the Mathline Elementary School Math Project.

## Number Sense and Computation: An Apple a Day

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Using this resource group, teachers can focus on the topic of number sense and computation by having students make estimates to analyze the number of apples per acre. Students learn to take samples and use benchmarks to make reasonable estimates. This resource group is part of the Mathline Elementary School Math Project.

## Geometry and Spatial Relations: It's a Perfect Fit (Part 1)

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Using this resource group, teachers can focus on the topic of geometry and spatial relations and, in particular, on identifying, describing, and classifying two-dimensional shapes. Students are challenged to duplicate two-dimensional shapes and sort a collection of shapes according to their attributes. This resource group is part of the Mathline Elementary School Math Project.

## Build Background (Odd Squad) | Teaching Tips

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A 1st grade teacher introduces the concept of length and reinforces good measurement practices to her students, specifically the importance of being precise. Working with students, she uses non-standard measuring units to demonstrate how to measure a distance precisely.

## Teaching Mathematical Practices (Odd Squad) | Teaching Tips

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In this segment, a 1st grade teacher discusses how she reinforces the mathematical concepts of being precise, persevering, and visualizing solutions in her unit on measurement.

## Agent Obfusco's Challenges | Odd Squad

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Olive and Otto have to solve a series of challenges to keep their Odd Squad badges. Olive and Otto become concerned when they find out that the test they have to take to keep their Odd Squad badges is being administered by Agent Obfusco, a mysterious agent who speaks only in word problems. They create number sentences to figure out the answers.

## Watch Together (Odd Squad) | Teaching Tips

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A 1st grade teacher uses a clip from Odd Squad to demonstrate measurement to her class. Students watch how Odd Squad agents use measurement to defeat the Hydroclops. They also model good mathematical practices such as being precise and persevering terms that are discussed and reinforced by the teacher.

## Number Sense and Computation: To Half or Half Not

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In this professional development video, teachers can focus on the topic of number sense and computation by creating equivalent fractions that represent one-half through the use of geoblocks. This video can be used in conjunction with the To Half or Half Not Lesson Plan.

## Wrap Up (Odd Squad) | Teaching Tips

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A 1st grade teacher reviews what the class has learned about measurement and tasks students to use a tool, like a marker or a teddy bear, to measure the distance between two objects at home.

## Adding to the 3rd Power: First Grade Edition | Making Math Matter

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Learn classroom strategies for teaching how to add three numbers up to 20 in this professional development video from Making Math Matter.

## Patterns and Relationships: The Magic Box

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Using this resource group, teachers can focus on the topic of patterns and relationships. Students learn to recognize, describe, create and extend repeating and arithmetic patterns. This resource group is part of the Mathline Elementary School Math Project.

## Geometry and Spatial Relations: It's a Perfect Fit (Part 3)

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In this professional development video, teachers focus on the topic of geometry and spatial relations by combining geoblocks to make three-dimensional shapes. This video can be used in conjunction with the "It's a Perfect Fit (Part 3)" lesson plan, as well as the "It's a Perfect Fit (Part 1 and Part 2)" videos and lesson plans.

## Peg Finds Her Marble - Peg + Cat | PBS KIDS Lab

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This video will help children use a pan balance to measure and compare weights. When Peg's marble accidentally flies into one of many identical bowls of spice, Cleopatra shows her how to use a pan balance to see which bowl contains her marble.

Este juego ayudará a niños a utilizar una balanza para medir y comparar distintos pesos. Cuando la canica de Peg vuela accidentalmente y cae dentro de uno de los muchos tazones de especias idénticos, Cleopatra le muestra cómo utilizar una balanza de platos para ver cuál tazón contiene su canica.