The purpose of this task is for students to select 2 numbers from a set of 3 that sum to 9. The task can be completed for sums equaling any number. Teachers may choose to ask students to write the simple equations they select.

This is a choral counting activity that can be easily adjusted as students learn higher numbers.

In this lesson, students learn that light travels in a straight line from a light source and that ray diagrams help us understand how an image will be created by a lens. In the accompanying activity, students explore the concepts behind the workings of a pinhole camera.

After analyzing photojournalist James Karales's iconic photograph of the march, reading background material on it, and considering what the marchers might have thought and felt, students write and illustrate a postcard describing this civil rights event from a marcher's viewpoint.

This art history video discussion looks at Piero della Francesca's "Portraits of the Duke and Duchess of Urbino", Federico da Montefeltro and Battista Sforza, 1467-72, tempera on panel (Galleria degli Uffizi, Florence).

This art history video discussion looks at Piero della Francesca's "The Baptism of Christ", 1450s, tempera on wood, 167 x 116 cm (National Gallery, London).

This art history video discussion examines Pierre Le Gros the Younger's "Stanislas Kostka on His Deathbed", 1703, upstairs at Bernini's Sant'Andrea al Quirinale.

Los estudiantes diseñan, construyen y prueban zapatos para desarrollar nuevos estilos y mejorar estilos ya existentes.

Students learn about a fascinating electromechanical coupling called piezoelectricity that is being employed and researched around the world for varied purposes, often for creative energy harvesting methods. A PowerPoint(TM) presentation provides an explanation of piezoelectric materials at the atomic scale, and how this phenomenon converts mechanical energy to electrical energy. A range of applications, both tested and conceptual, are presented to engage students in the topic. Gaining this background understanding prepares students to conduct the associated hands-on activity in which they create their own small piezoelectric "generators."

In a class demonstration, the teacher places different pill types ("chalk" pill, gel pill, and gel tablet) into separate glass beakers of vinegar, representing human stomach acid. After 20-30 minutes, the pills dissolve. Students observe which dissolve the fastest, and discuss the remnants of the various pills. What they learn contributes to their ongoing objective to answer the challenge question presented in lesson 1 of this unit.

Students use the free computer game Pingus to learn how engineers, specifically environmental engineers, use their technical writing skills to give instructions and follow the instructions of others. Students learn to write instructions to express their ideas in clear, organized ways using descriptive, un-ambiguous sentences, as an example of one type of technical writing that important for engineers. The students write instructions enumerating how to beat a game level, which represents surveying that level for environmental problems. As a test of their instructions, students review each others' instructions and offer suggestions for improvement, and then revise their instructions to make them better. Students also see some examples of environmental problems.

Students are introduced to prosthetics history, purpose and benefits, main components, main types, materials, control methods, modern examples including modern materials used to make replacement body parts and the engineering design considerations to develop prostheses. They learn how engineers and medical doctors work together to improve the lives of people with amputations and the challenges faced when designing new prostheses with functional and cosmetic criteria and constraints. A PowerPoint(TM) presentation and two worksheets are provided.

An Interactive Course on Mandarin Chinese Pronunciation.
Pitch Perfect Pinyin is a two-part interactive website for learning Pinyin pronunciation.

To further their understanding of sound energy, students identify the different pitches and frequencies created by a vibrating ruler and a straw kazoo. They create high- and low-pitch sound waves.

This task requires students to use functions to calculate how to best benefit from a pizza promotion.

This short video and interactive assessment activity is designed to teach fourth graders about four operations - missing operation.

This short video and interactive assessment activity is designed to teach fifth graders about adding, subtracting, multiplying and dividing - missing operation.

This short video and interactive assessment activity is designed to teach fourth graders about adding, subtracting, and multiplying with parentheses - missing operation.

This short video and interactive assessment activity is designed to teach fifth graders about adding and subtracting with parentheses ii.

This short video and interactive assessment activity is designed to teach fifth graders about placing the missing parentheses to make the equation true.