Student tools
Apps for my students
Free, interactive tools that put the math from class to work on real decisions. Each one runs in your browser and stores nothing.
Credit Card Payoff Simulator
Enter a balance, interest rate and payment to see your payoff date, the total interest you'll pay, and how much you save compared with paying only the minimum. Includes a month-by-month schedule and a balance chart.
cc-debt-payoff.winsomemundy.com Number theory · Prime numbersSieve of Eratosthenes
Enter a number and watch every prime up to it appear, one step at a time. Step forward and back, or play it through, while each step explains which numbers are crossed out and why.
sieve.winsomemundy.com Geometry · Perimeter, area & similarityTangram Geometry Lab
Measure the seven tangram pieces, compare congruent and similar figures, and prove that the pieces add up to the square. Check your answers as you go, with an answer key for teachers.
tangram.winsomemundy.com Algebra · Modular arithmeticAffine Cipher Lab
See how the affine cipher hides a message with a little algebra, then encode and decode by hand. Check your answers letter by letter, find the inverse of a yourself, and open the worked steps when you're stuck. Includes a printable study guide.
cipher.winsomemundy.com