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### Area of Triangles

To find the area of a triangle, try to make a parallelogram using a copy of the triangle.

### Handshakes

When the nine justices of the Supreme Court meet, they greet one another with a handshake to show harmony of purpose, even though their views may differ. How many handshakes occur? In general, how many handshakes occur when there are n people?

### Using an Elevator to Evaluate Signed Number Expressions

Using an Elevator to Evaluate Signed Number Expressions Using the idea of an elevator moving up and down, students will be given a small set of rules to add and subtract signed integers. The idea behind the method of adding and subtracting signed integers offered in these lesson is that the number of rules that s

### Can You KenKen?

### Geogebra:Dynagraphs

Explore relationships between inputs and outputs by manipulating interactive double number lines.

**This interactive is optimized for your desktop and tablet. **

### Isosceles Triangle Area

### Is the Last Banana Game Fair?

*MTLT*article, “ Is the Last Banana Game Fair?” by Patrick Sullivan. The lesson engages students in simulations to calculate experimental probabilities and confirm those results by examining theoretical probabilities.

### Revealing the Story in Hydrographs from Hurricane Harvey

*MTLT*article, “Making Meaning of Numbers from a Historic Storm" by Ming Tomayko. The lesson uses media coverage of a natural disaster to support students' development of quantitative literacy.

### The Golden Ratio and the Fibonacci Sequence in Popular Media

*MTLT*article, “Incorporating Popular Media to Engage Students” by Michelle Meadows and Joanne Caniglia. The lesson engages students in the beauty and power of the Golden Ratio using media to spark curiosity!