Thomas Bretl

ProbSim is a probability experiment simulator. You can flip coins, roll dice, spin spinners, and draw marbles from urns. Predict the probability of a …

Calc Visualizer helps the user better understand some of the most important concepts of calculus. The app includes six different modules: 1) Descartes …

Reckonings 2, an enhanced version of Reckonings, is a mathematics game that challenges players to hit nine target numbers by using addition, subtracti …

Test your mental arithmetic and estimation skills by throwing "arithmeDarts" at target balloons that are attached to a number line. Aim the darts by e …

Using just three simple commands (forward, left, and right ), guide the mouse Algernon through a maze to reach a piece of cheese. This app is especial …

A small yellow box follows a mystery path across a tabletop. By observing the box's motion in only one dimension, from either the front or the side, t …

This app gives students a chance to improve their basic arithmetic skills as they solve problems involving addition, subtraction, multiplication, and …

Based on Donna Bretl's wood "Bretl Blocks" puzzles, GeoFit challenges you to fit small squares, diamonds, triangles, and trapezoids into square, hexag …

Investigate 3x3and 4x4 arrays of both numbers and shapes. Solve magic squares and create beautiful geometric patterns that change in surprising ways w …

Arithmetic Quilts combines mathematics and art. Addition tables, multiplication tables, and tables based on more complex operations are displayed as c …