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# FREE Gizmos

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See How FREE Gizmos WorkRounding Whole Numbers (Number Line)

FREE *with no time limit!*

Place points on a number line. Round these values to the nearest ten or hundred. Visualize rounding by showing the number line as a hill or series of hills. These hills cause the points to...

Lesson Info Launch GizmoTarget Sum Card Game (Multi-digit Addition)

FREE *with no time limit!*

Play an addition card game! The goal is to create a sum that is as close as possible to the target sum. Students will deepen their understanding of place value as they get better at playing...

Lesson Info Launch GizmoFraction Artist 1 (Area Models of Fractions)

FREE *with no time limit!*

Develop understanding of fractions by making modern paintings. Find different ways to divide a canvas into equal-sized sections. Make paintings to represent simple fractions and to find...

Lesson Info Launch GizmoMultiplying Decimals (Area Model)

FREE *with no time limit!*

Model the product of two decimals by finding the area of a rectangle. Estimate the area of the rectangle first. Then break the rectangle into several pieces and find the area of each piece...

Lesson Info Launch GizmoTreasure Hunter (Decimals on the Number Line)

FREE *with no time limit!*

Drive a desert highway searching for buried treasure. Learn to use the car's tens, ones, tenths, and hundredths gears, along with a GPS system (number line), to find the right place to dig....

Lesson Info Launch GizmoFraction, Decimal, Percent (Area and Grid Models)

FREE *with no time limit!*

Model and compare fractions, decimals, and percents using area models. Each area model can have 10 or 100 sections and can be set to display a fraction, decimal, or percent. Click inside...

Lesson Info Launch GizmoFruit Production

- Stem Case

*Video Preview*

As an agricultural scientist, students help a strawberry farmer who is having problems with low fruit production. Students learn about the factors involved in fruit production including...

Lesson InfoRiver Erosion

- New!

FREE *with no time limit!*

Explore how river erosion affects landscapes in the short term and over long periods of time. Describe the features of mountain streams and meandering rivers, and use a floating barrel to...

Lesson Info Launch GizmoFlood and Storm-Proof Homes

- New!

FREE *with no time limit!*

Build a home to survive a flood or a hurricane and protect the people inside. Choose materials and a design for the foundation, frame, walls, and roof of the house. Add "extras" such as...

Lesson Info Launch GizmoPrairie Ecosystem

FREE *with no time limit!*

Observe the populations of grass, prairie dogs, ferrets and foxes in a prairie ecosystem. Investigate feeding relationships and determine the food chain. Bar graphs and line graphs show...

Lesson Info Launch GizmoIntroduction to Functions

FREE *with no time limit!*

Determine if a relation is a function using the mapping diagram, ordered pairs, or the graph of the relation. Drag arrows from the domain to the range, type in ordered pairs, or drag points...

Lesson Info Launch GizmoReaction Time 1 (Graphs and Statistics)

FREE *with no time limit!*

Test your reaction time by catching a falling ruler or clicking a target. Create a data set of experiment results, and calculate the range, mode, median, and mean of your data. Data can be...

Lesson Info Launch GizmoSolving Algebraic Equations II

FREE *with no time limit!*

Is solving equations tricky? If you know how to isolate a variable, you're halfway there. The other half? Don't do anything to upset the balance of an equation. Join our plucky variable...

Lesson Info Launch GizmoAdding and Subtracting Integers with Chips

FREE *with no time limit!*

Use chips to model addition and subtraction of positives and negatives. Explore the effect of zero pairs. See how to use zero pairs to help special cases of addition and subtraction.

Lesson Info Launch GizmoGeometric Probability

FREE *with no time limit!*

Randomly throw darts at a target and see what percent are "hits." Vary the size of the target and repeat the experiment. Study the relationship between the area of the target and the...

Lesson Info Launch GizmoEstimating Population Size

FREE *with no time limit!*

Adjust the number of fish in a lake to be tagged and the number of fish to be recaptured. Use the number of tagged fish in the catch to estimate the number of fish in the lake.

Lesson Info Launch GizmoRNA and Protein Synthesis

- Updated!

FREE *with no time limit!*

Go through the process of synthesizing proteins through RNA transcription and translation. Learn about the many steps involved in protein synthesis including: unzipping of DNA, formation of...

Lesson Info Launch GizmoCovalent Bonds

FREE *with no time limit!*

Choose a substance, and then move electrons between atoms to form covalent bonds and build molecules. Observe the orbits of shared electrons in single, double, and triple covalent bonds....

Lesson Info Launch GizmoWeather Maps

FREE *with no time limit!*

Learn about standard symbols used in meteorology to construct weather maps. Rain, sleet, snow, temperature, cloud cover, wind speed and direction, and atmospheric pressure can all be...

Lesson Info Launch GizmoAdditive Colors

FREE *with no time limit!*

Control the intensity of red, green, and blue spotlights. Additive colors can be observed where the spotlights overlap. The RGB value of any point can be measured. Just about any color can...

Lesson Info Launch GizmoChemical Changes

FREE *with no time limit!*

Chemical changes result in the formation of new substances. But how can you tell if a chemical change has occurred? Explore this question by observing and measuring a variety of chemical...

Lesson Info Launch GizmoSolving Linear Systems (Standard Form)

FREE *with no time limit!*

Solve systems of linear equations, written in standard form. Explore what it means to solve systems algebraically (with substitution or elimination) and graphically. Also, use a draggable...

Lesson Info Launch GizmoExponential Functions

FREE *with no time limit!*

Explore the graph of an exponential function. Vary the coefficient and base of the function and investigate the changes to the graph of the function.

Lesson Info Launch GizmoDistance Formula

FREE *with no time limit!*

Explore the distance formula as an application of the Pythagorean theorem. Learn to see any two points as the endpoints of the hypotenuse of a right triangle. Drag those points and...

Lesson Info Launch GizmoProving Triangles Congruent

FREE *with no time limit!*

Apply constraints to two triangles. Then drag the vertices of the triangles around and determine which constraints guarantee congruence.

Lesson Info Launch GizmoRiemann Sum

FREE *with no time limit!*

Approximate the area under a curve in an interval using rectangles. Compare the results of left-hand summation to the results of right-hand summation. Vary the interval and the number of...

Lesson Info Launch GizmoSine Function

FREE *with no time limit!*

Compare the graph of the sine function with the graph of the angle on the unit circle. Drag a point along the sine curve and see the corresponding angle on the unit circle.

Lesson Info Launch GizmoFast Plants^{®} 1 - Growth and Genetics

- New!

FREE *with no time limit!*

Grow Wisconsin Fast Plants® in a simulated lab environment. Explore the life cycles of these plants and how their growth is influenced by light, water, and crowding. Practice pollinating...

Lesson Info Launch GizmoFast Plants^{®} 2 - Mystery Parent

- New!

FREE *with no time limit!*

In this follow-up to Fast Plants® 1 - Growth and Genetics, continue to explore inheritance of traits in Wisconsin Fast Plants. Infer the genotype of a "mystery P2 parent" of a set of Fast...

Lesson Info Launch GizmoCrumple Zones

- New!

FREE *with no time limit!*

Design a car to protect a test dummy in a collision. Adjust the length and stiffness of the crumple zone and the rigidity of the safety cell to determine how the car will deform during the...

Lesson Info Launch GizmoWaves

FREE *with no time limit!*

Observe and measure transverse, longitudinal, and combined waves on a model of a spring moved by a hand. Adjust the amplitude and frequency of the hand, and the tension and density of the...

Lesson Info Launch GizmoIdeal Gas Law

- New!

FREE *with no time limit!*

Explore relationships between amount, temperature, pressure, and volume for an ideal gas in a chamber with a moveable piston. Discover rules of proportionality contained in Boyle's law,...

Lesson Info Launch GizmoDisease Spread

- Updated!

FREE *with no time limit!*

Observe the spread of disease through a group of people. The methods of transmission can be chosen and include person-to-person, airborne, and foodborne as well as any combination thereof....

Lesson Info Launch GizmoCompound Interest

FREE *with no time limit!*

Explore compound interest in-depth, from compounded annually to compounded continuously. In addition, compare the END POINTS graph, with dots that fit an exponential curve, to the ALL TIME...

Lesson Info Launch GizmoSorry, we could not find any Upcoming Free Gizmos to show you!

Sorry, we could not find any Upcoming Free Gizmos to show you!

How Free Gizmos Work

Start teaching with
**20-40 Free Gizmos**. See the full list.

Access **lesson materials** for Free Gizmos including teacher guides, lesson plans, and more.

All other Gizmos are limited to a **5 Minute Preview** and can only be used for 5 minutes a day.

**Free Gizmos change each semester.** The new collection will be available Jul 01, 2023.

About STEM Cases

Students assume the role of a scientist trying to solve a real world problem. They use scientific practices to collect and analyze data, and form and test a hypothesis as they solve the problems.

Each STEM Case uses realtime reporting to show live student results.

Introduction to the Heatmap

STEM Cases take between 30-90 minutes for students to complete, depending on the case.

Student progress is automatically saved so that STEM Cases can be completed over multiple sessions.

Multiple grade-appropriate versions, or levels, exist for each STEM Case.

Each STEM Case level has an associated Handbook. These are interactive guides that focus on the science concepts underlying the case.

Rounding Whole Numbers (Number Line)

FREE *with no time limit!*

Place points on a number line. Round these values to the nearest ten or hundred. Visualize rounding by showing the number line as a hill or series of hills. These hills cause the points to roll to the nearest valley (nearest multiple of ten or one hundred).

Lesson Info Launch GizmoTarget Sum Card Game (Multi-digit Addition)

FREE *with no time limit!*

Play an addition card game! The goal is to create a sum that is as close as possible to the target sum. Students will deepen their understanding of place value as they get better at playing the game. Many game options allow students to vary the game for more practice. The game can be played with one or two players.

Lesson Info Launch GizmoFraction Artist 1 (Area Models of Fractions)

FREE *with no time limit!*

Develop understanding of fractions by making modern paintings. Find different ways to divide a canvas into equal-sized sections. Make paintings to represent simple fractions and to find fractions that are equivalent to one-half.

Lesson Info Launch GizmoMultiplying Decimals (Area Model)

FREE *with no time limit!*

Model the product of two decimals by finding the area of a rectangle. Estimate the area of the rectangle first. Then break the rectangle into several pieces and find the area of each piece (partial product). Add these areas together to find the whole area (product).

Lesson Info Launch GizmoTreasure Hunter (Decimals on the Number Line)

FREE *with no time limit!*

Drive a desert highway searching for buried treasure. Learn to use the car's tens, ones, tenths, and hundredths gears, along with a GPS system (number line), to find the right place to dig. Plot your find on a zoomable number line map. Can you become a master Treasure Hunter?

Lesson Info Launch GizmoFraction, Decimal, Percent (Area and Grid Models)

FREE *with no time limit!*

Model and compare fractions, decimals, and percents using area models. Each area model can have 10 or 100 sections and can be set to display a fraction, decimal, or percent. Click inside the area models to shade them. Compare the numbers visually or on a number line.

Lesson Info Launch GizmoFruit Production

- Stem Case

*Video Preview*

As an agricultural scientist, students help a strawberry farmer who is having problems with low fruit production. Students learn about the factors involved in fruit production including plant nutrients, pollination and bees, and the interaction with the environment.

Lesson InfoRiver Erosion

- New!

FREE *with no time limit!*

Explore how river erosion affects landscapes in the short term and over long periods of time. Describe the features of mountain streams and meandering rivers, and use a floating barrel to estimate current speed. Witness the changes that occur as mountain streams erode downward and meandering rivers erode from side to side.

Lesson Info Launch GizmoFlood and Storm-Proof Homes

- New!

FREE *with no time limit!*

Build a home to survive a flood or a hurricane and protect the people inside. Choose materials and a design for the foundation, frame, walls, and roof of the house. Add "extras" such as sand bags, storm shutters, and roof clips. Test your house in a flood or storm and see how well your design worked.

Lesson Info Launch GizmoPrairie Ecosystem

FREE *with no time limit!*

Observe the populations of grass, prairie dogs, ferrets and foxes in a prairie ecosystem. Investigate feeding relationships and determine the food chain. Bar graphs and line graphs show changes in populations over time.

Lesson Info Launch GizmoIntroduction to Functions

FREE *with no time limit!*

Determine if a relation is a function using the mapping diagram, ordered pairs, or the graph of the relation. Drag arrows from the domain to the range, type in ordered pairs, or drag points to the graph to add inputs and outputs to the relation.

Lesson Info Launch GizmoReaction Time 1 (Graphs and Statistics)

FREE *with no time limit!*

Test your reaction time by catching a falling ruler or clicking a target. Create a data set of experiment results, and calculate the range, mode, median, and mean of your data. Data can be displayed on a list, table, bar graph or dot plot. The Reaction Time 1 Student Exploration focuses on range, mode, and median.

Lesson Info Launch GizmoSolving Algebraic Equations II

FREE *with no time limit!*

Is solving equations tricky? If you know how to isolate a variable, you're halfway there. The other half? Don't do anything to upset the balance of an equation. Join our plucky variable friend as he encounters algebraic equations and a (sometimes grumpy) equal sign. With a little practice, you'll find that solving equations isn't tricky at all.

Lesson Info Launch GizmoAdding and Subtracting Integers with Chips

FREE *with no time limit!*

Use chips to model addition and subtraction of positives and negatives. Explore the effect of zero pairs. See how to use zero pairs to help special cases of addition and subtraction.

Lesson Info Launch GizmoGeometric Probability

FREE *with no time limit!*

Randomly throw darts at a target and see what percent are "hits." Vary the size of the target and repeat the experiment. Study the relationship between the area of the target and the percent of darts that strike it

Lesson Info Launch GizmoEstimating Population Size

FREE *with no time limit!*

Adjust the number of fish in a lake to be tagged and the number of fish to be recaptured. Use the number of tagged fish in the catch to estimate the number of fish in the lake.

Lesson Info Launch GizmoRNA and Protein Synthesis

- Updated!

FREE *with no time limit!*

Go through the process of synthesizing proteins through RNA transcription and translation. Learn about the many steps involved in protein synthesis including: unzipping of DNA, formation of mRNA, attaching of mRNA to the ribosome, and linking of amino acids to form a protein.

Lesson Info Launch GizmoCovalent Bonds

FREE *with no time limit!*

Choose a substance, and then move electrons between atoms to form covalent bonds and build molecules. Observe the orbits of shared electrons in single, double, and triple covalent bonds. Compare the completed molecules to the corresponding Lewis diagrams.

Lesson Info Launch GizmoWeather Maps

FREE *with no time limit!*

Learn about standard symbols used in meteorology to construct weather maps. Rain, sleet, snow, temperature, cloud cover, wind speed and direction, and atmospheric pressure can all be recorded at two different weather stations on a map. Describe weather patterns characteristic of high-pressure systems, low-pressure systems, warm fronts, and cold fronts.

Lesson Info Launch GizmoAdditive Colors

FREE *with no time limit!*

Control the intensity of red, green, and blue spotlights. Additive colors can be observed where the spotlights overlap. The RGB value of any point can be measured. Just about any color can be created by mixing varying amounts of red, green, and blue light.

Lesson Info Launch GizmoChemical Changes

FREE *with no time limit!*

Chemical changes result in the formation of new substances. But how can you tell if a chemical change has occurred? Explore this question by observing and measuring a variety of chemical reactions. Along the way you will learn about chemical equations, acids and bases, exothermic and endothermic reactions, and conservation of matter.

Lesson Info Launch GizmoSolving Linear Systems (Standard Form)

FREE *with no time limit!*

Solve systems of linear equations, written in standard form. Explore what it means to solve systems algebraically (with substitution or elimination) and graphically. Also, use a draggable green point to see what it means when (*x*, *y*) values are solutions of an equation, or of a system of equations.

Exponential Functions

FREE *with no time limit!*

Explore the graph of an exponential function. Vary the coefficient and base of the function and investigate the changes to the graph of the function.

Lesson Info Launch GizmoDistance Formula

FREE *with no time limit!*

Explore the distance formula as an application of the Pythagorean theorem. Learn to see any two points as the endpoints of the hypotenuse of a right triangle. Drag those points and examine changes to the triangle and the distance calculation.

Lesson Info Launch GizmoProving Triangles Congruent

FREE *with no time limit!*

Apply constraints to two triangles. Then drag the vertices of the triangles around and determine which constraints guarantee congruence.

Lesson Info Launch GizmoRiemann Sum

FREE *with no time limit!*

Approximate the area under a curve in an interval using rectangles. Compare the results of left-hand summation to the results of right-hand summation. Vary the interval and the number of rectangles and explore how the graph of the rectangles and curve change in response.

Lesson Info Launch GizmoSine Function

FREE *with no time limit!*

Compare the graph of the sine function with the graph of the angle on the unit circle. Drag a point along the sine curve and see the corresponding angle on the unit circle.

Lesson Info Launch GizmoFast Plants^{®} 1 - Growth and Genetics

- New!

FREE *with no time limit!*

Grow Wisconsin Fast Plants^{®} in a simulated lab environment. Explore the life cycles of these plants and how their growth is influenced by light, water, and crowding. Practice pollinating the plants using bee sticks, then observe the traits of the offspring plants. Use Punnett squares to model the inheritance of genes for stem color and leaf color for these plants.

Fast Plants^{®} 2 - Mystery Parent

- New!

FREE *with no time limit!*

In this follow-up to Fast Plants^{®} 1 - Growth and Genetics, continue to explore inheritance of traits in Wisconsin Fast Plants. Infer the genotype of a "mystery P2 parent" of a set of Fast Plants based on the traits of the P1, F1, and F2 plants. Then create designer Fast Plants by selectively breeding plants with desired traits.

Crumple Zones

- New!

FREE *with no time limit!*

Design a car to protect a test dummy in a collision. Adjust the length and stiffness of the crumple zone and the rigidity of the safety cell to determine how the car will deform during the crash. Add seat belts and/or airbags to prevent the dummy from hitting the steering wheel. Three different body types (sedan, SUV, and subcompact) are available and a wide range of crash speeds can be used.

Lesson Info Launch GizmoWaves

FREE *with no time limit!*

Observe and measure transverse, longitudinal, and combined waves on a model of a spring moved by a hand. Adjust the amplitude and frequency of the hand, and the tension and density of the spring. The speed and power of the waves is reported, and the wavelength and amplitude can be measured.

Lesson Info Launch GizmoIdeal Gas Law

- New!

FREE *with no time limit!*

Explore relationships between amount, temperature, pressure, and volume for an ideal gas in a chamber with a moveable piston. Discover rules of proportionality contained in Boyle's law, Charles's law, Avogadro's law, and Gay-Lussac's law. Use these relationships to derive the ideal gas law and calculate the value of the ideal gas constant.

Lesson Info Launch GizmoDisease Spread

- Updated!

FREE *with no time limit!*

Observe the spread of disease through a group of people. The methods of transmission can be chosen and include person-to-person, airborne, and foodborne as well as any combination thereof. The probability of each form of transmission and number of people in the group can also be adjusted.

Lesson Info Launch GizmoCompound Interest

FREE *with no time limit!*

Explore compound interest in-depth, from compounded annually to compounded continuously. In addition, compare the END POINTS graph, with dots that fit an exponential curve, to the ALL TIME graph, which has a more step-like appearance.

Lesson Info Launch GizmoFind Your Solution

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