Curated OER
Side Splitter Triangles
Students investigate the side splitter theorem. In this geometry instructional activity, students estimate and solve problems dealing with ratios and proportions. They identify angles created by lines that are parallel.
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Balancing the Scales: Understanding Ratios
Students are introduced to the concept of ratios. In groups, they convert sets of numbers into a ratio. After practicing, they use the ratios and proportions to solve story problems. They also calculate map distances and discover map...
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Dream Bedroom Floor Plan
Students build and apply concepts of geometry. For this geometry lesson, students create a building using proportions and scale drawings. They use Cabri technology to create a virtual drawing first.
Inside Mathematics
Expressions
Strive to think outside of the quadrilateral parallelogram. Worksheet includes two problems applying prior knowledge of area and perimeter to parallelograms and trapezoids. The focus is on finding and utilizing the proper formula and...
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Exploring Geometric Mean
Students solve problems using geometric means. In this geometry instructional activity, students create altitudes in right triangles. They use Cabri software to move the triangle around and observe different sides and angles.
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Similar Triangles
Students differentiate between similar and congruent triangles. In this geometry lesson plan, students identify the missing side and angle of a triangle. They identify the different ratio and proportion of the sides of a triangle.
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More for my Money
Students solve problems involving ratio and proportion. In this algebra lesson, students analyze the currencies found in different countries. They create formulas to convert between the different currencies and use ratio and proportion...
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Charting a New Course
Students calculate the distance they will travel. In this geometry lesson plan, students use the TI and CBL system to make calculation of a certain path. They explore geography by calculating distances between different areas as it...
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Task: Grain Storage
Farming is full of mathematics, and it provides numerous real-world examples for young mathematicians to study. Here, we look at a cylinder-shaped storage silo that has one flat side. Given certain dimensions, students need to determine...
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Is Bigger Always Better?
Explore rational numbers with the young mathematicians in your class. They will investigate decimals, fractions, and percents before ordering and comparing rational numbers. This multi-day unit includes differentiation activities and...
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The Fourth Quadrant of Proportiona
Students experiment with scale to solve a problem presented in a video clip. They determine the correct size to use when constructing a model and evaluate the use of proportions in real life applications.
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An Application of Congruence
Students solve triangles using the properties if congruency. In this geometry lesson, students apply congruent and similar figures to solve real world and math problems. They show they are able to follow instructions.
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Are you in Golden Shape
Students solve and verify the solution for unknown measures. In this geometry lesson plan, students identify the properties of circles. They use the arc, angle and segment relationship to find the missing measures.
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Buying a Car
Students complete the PLATO ¿¿ Educational Software lesson: Math Problem Solving: Car Costs to determine if he/she can afford to drive the car they are planning to buy.
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Not Everything is More Expensive
Students explore percent increases and decreases. They calculate the percent increase and decrease. Students use math to solve problems and communicate. They apply the given formula for percent increase/decrease.
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How Far Can You Go On a Tank Of Gas?
Students calculate the distance they can travel on a tank of gas. In this algebra lesson plan, students use ratio and proportion to solve word problems. They graph their results and discuss their findings with the class.
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Aldridge Sawmill - The Story in Numbers
Seventh graders practice math skills while becoming familiar with Texas' "Boom & Bust" economy and the natural history of the east Texas Piney Woods. After researching the Aldridge Sawmill, 7th graders utilize a worksheet imbedded in...
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Finding Total Given Part and Percentage
Students observe models of fractional parts. After writing the definitions of percent, part and whole, students use the calculators and computers to solve problems. Individually, they complete assigned problems where the convert the...
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When Am I Ever Going to Use this?
Students solve problems using equations and properties of integers. In this algebra lesson, students solve problems using ratio and proportion and graph their answers on a coordinate plane. They solve word problems using geometry.
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Get the Turtle to the Pond
Students solve problems. In this math lesson, students write solutions using LOGO commands in order to help get the turtle to the pond.
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Algebra: Lesson 4
Eighth graders participate in using algebraic proportional reasoning to find the missing amount that balances on a scale. Substitution is used to discover the missing objects on a scale. They answer multiple choice questions that are...
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From Probability to Combinatorics and Number Theory
Students see how division is used to help solve probability problems. They use tables as data structures where they are used to count outcomes and to compute probabilities. Students use games to help solve probability problems.
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Sin, Cos and Tangent
Students find the identity o sine, cosine and tangent. In this precalculus lesson, students solve and identify the different parts of a right triangle. They use the ratios of the Pythagorean Theorem to find the missing side or angle.