Okta challenges you to a duel! That crazy octopus wants to play you in a game where the first person to choose cards with a specified sum wins. You can choose how many cards, what types of numbers, and Okta's level of strategy.

This lesson plan introduces the game Deep Sea Duel, which develops students' operation skills and strategic thinking, and can be played online or with cards. After playing several variations of the game, students attempt to identify a winning strategy and compare the game to other familiar games. Variations include whole numbers, decimals, fractions, exponents, and words. The lesson includes printable cards and a student worksheet, questions for student discussion and teacher reflection, assessment options, and extensions. The online game and the cited article are cataloged separately.

In this video segment adapted from Navajo Technical College, meet a dendroclimatologist who studies the relationship between precipitation and tree growth in the Navajo Nation.

In this lab activity, students determine density differences of water samples with varying temperature and salinity levels. Students synthesize information to predict the effects of oil in given water samples.

Students are challenged to design a permanent guest village within the Saguaro National Park in Arizona. The design must provide a true desert experience to visitors while emphasizing sustainable design, protection of the natural environment, and energy and resource conservation. To successfully address and respond to this challenge, students must acquire an understanding of desert ecology, environmental limiting factors, species adaptations and resource utilization. Following theintroduction, students generate ideas and consider the knowledge required to complete the challenge. The lectures and activities that follow serve to develop this level of comprehension. To introduce the concepts of healthy ecosystems, biomimetics and the importance of sustainable environmental design, students watch three video clips of experts. These clips provide direction for student research and challenge design solutions.

In this problem-based learning (PBL) activity, students take on the role of a student research scientist and explore the role of solar energy in determining climate, focusing on the urban heat island effect. Students conduct research and compare temperatures between two cities, and determine the factors that are responsible for the difference exhibited between them. The lesson is supported by teacher notes, answer key, glossary and an appendix with information about using PBL in the classroom. This is the third of three activities in Investigating the Climate System: Energy, a Balancing Act, and serves as an authentic assessment for all three modules.

In this unit, students make regular journal entries about a plant/animal/insect community in the natural area around our school and use this to create a Non-fiction Class Book. They also interview family/resources to discover, record and present stories about human relationships with nature from their culture(s).

In this 6-lesson unit, students use dominoes to explore four models of addition: counting, number line, sets, and balanced equations. They learn about the commutative property, the relation between addition and subtraction, the result of adding 0, and the concept of doubles. Students write story problems which involve the operation of addition and begin to memorize the addition facts. They represent addition in pictures. The various models of addition help students develop a rich conceptual schema for addition. Included are a Bibliography of Counting Books, student materials, questions for student and teacher reflection, assessment and extension ideas. [Suggestion: Use the alternate applet, Pan Balance - Numbers, listed as a Related Resource, rather than Pan Balance - Shapes, in Lesson 4.]

In this macroeconomics problem, students check to see whether they understand the role nominal aggregate demand and inflation expectations play in determining the economy's output level and inflation rate.

The lecture focused on the banking system and included a discussion about total reserves, required reserves and excess reserves. Students practiced calculating each category in pairs and then compared their solutions with those of the instructor.

This document is a Docoumented Problem Solving exercise that utilizes the Keynesian model of the macroeconomy.

Gross domestic product (GDP) was introduced in class as a way to determine the value of a country's output. Consumption, investment, government spending, and net exports were discussed as the components of GDP. Items that are excluded from GDP were also discussed.

Following a lecture about unemployment, students are asked to calculate the unemployment rate. They will need to apply their knowledge about unemployment and the labor force in order to make the calculation.

Determining a Tax Structure - The different tax structures are reinforced through the calculation of the tax rate at two different income levels.

In this assignment, students think about four events that would affect a country's exchange rate. Without actually drawing a supply and demand diagram, students say what direction, if at all, each curve would shift��and whether the currency would appreciate or depreciate as a result.

The topic of gross domestic product (GDP) was introduced in class. The components of GDP - consumption, investment, government spending, and net exports - were discussed. The items that are excluded from GDP and the difference between GDP and gross national product (GNP) were also explained.

Students in an economics course are asked to write a doumented problem solution to explain how a change in a determinant of demand will impact the equilibrium price.

The concept of comparative advantage is used to make a decision about specialization and trade. The microeconomic impact is also included.

The concept of price elasticity of demand was introduced in class. Elastic and inelastic goods were discussed. The impact that a change in price will have on total revenue was also presented.

During the lecture, labor demand and labor supply were discussed and were used to determine the equilibrium wage rate. Then, the concept of a minimum wage rate was introduced and the impact of the wage rate on the labor market was demonstrated graphically.