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Lesson Plans
- "3N+1" Problem
- A problem from the Russian Math Olympiad
- A proof of the Pythagorean theorem using similar triangles
- A puzzle with 1089
- Addition Board
- Addition in kindergarten and first grade
- An arithmetical prodigy from 1899
- An old merchant and his four children
- Ancient Knot
- Animations on the TI
- Areas and Borders
- Area & Perimeter
- Average test grade
- Ball in a Box
- Banana
- Barrels, Casks and Other Curvy Containers
- Big numbers AKA Grains of rice on a chess board
- Block houses
- Building a scale-model doghouse
- Candles
- Candy Baskets
- Capacity
- Chambered Nautilus
- Checking if a number is a prime number
- Chinese Calendar Box
- Chords in a circle
- Circle, Square, and Triangle
- Clocks and Time
- Coins
- Coloring lines in a hexagon
- Colorful Triangles
- Congruent Triangles
- Counting
- Counting board for young learners
- Counting to 100
- Creasing Paper Along Curves
- Cubes
- Cube with One Edge Sliced Off
- Cuisinaire Strips
- Cutting a rectangle
- Cutting a triangle
- Cutting a triangle into two pieces of equal area and equal perimeter
- Cutting an equilateral triangle
- Cutting Polyhedra
- Deriving the formula for the area of a triangle
- Diagonal of a Square
- Dividing a square
- Division with remainder on the TI-108: Two examples
- Dogs, Cats, and Mice
- Dot-to-Dot
- Doubling and halving
- Drawing a rectangle
- Drawing a simple figure from verbal instructions
- Drawing Triangles
- Easy Squares
- Egg Dilemma (Part 1)
- Exponentiation
- Factoring
- Fancy Envelopes
- Finding a fraction between two fractions
- Five-pointed 3D Star
- Flipping coins
- Four Bugs
- Four Cards
- Four Cubes
- From One Billion to Zero
- From one to one trillion
- Game of Circles and Stars
- Game of tens
- Giant Enchilada
- Halloween Hat
- Heads or tails?
- Hexagonal Puzzle
- How Does a Calculator Compute The Square Root Of a Number?
- How many pentominoes?
- How to measure an angle without a protractor
- How to transform a rectangle to a different rectangle
- Hyperbolas & Ellipses
- Inscribed Triangle
- Interest
- Julekurv AKA Valentine Basket
- Kites
- Leaky Roof
- Long-eared critters
- Magic Beans
- Magic Folding Cube
- Magic Square
- Making Animals by Cutting Polygon Puzzles
- Making Blocks From Four Cubes
- Making Boxes
- Making an Involute
- Maze
- Mini Slot Machine
- Moons
- More dot-to-dot tasks
- More old word problems
- Multiplications "Done according to Adam Ries"
- Nathan tosses a coin 20 times
- Number Game with Dice
- One Third
- Paradox of averages
- Partitoning A Square
- Pentagon Puzzles
- Phone number algebra
- Piggybank
- Playing with shapes
- Powerball 55
- Pretty Gift Box
- Pumpkins
- Puzzle with pebbles
- Pyramid into fourths
- Pyramid of Cubes
- Pyramid of Marbles
- Quadrilaterals
- Regular Polygons with Equal Areas
- Related problems
- Right triangle
- Sequences of composite numbers: A contest
- Shapes of numbers
- Shapes of numbers using triangles
- Six Pyramids
- Sixteen Square Inches
- Solomon's Sealv
- Sorting game
- Spirial (grades 5-8)
- Spirial (grades 5-8)
- The Spiral of Theodorus on the TI-83/84 Calculator
- Square and cubic units
- Square in a Triangle
- Straw Polyhedra
- Subtraction Algorithm
- Subtraction Counters
- Sums of two squares
- Survivor on a Hexagonal Island
- Tatami
- Tea Boxes
- Temperature Conversions
- Tessellating a Circle
- The ladder and box problem
- “The Laughing Cow” Cheese Wedge Containers
- The Practical Value of Proofs
- Three fourths
- Three-Piece Circle Puzzle
- Tossing One Die
- Triangle to square: A hinged dissection
- Turning a rectangle into a square by dissection
- Twelve easy pieces
- Twenty-four Cubes
- Two Old Problems
- Two Shepherd Brothers
- Understanding Long Division
- Unusual Containers
- What next?
- What rectangle is this?
- Yin Yang
Breakingaway
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