Projects

How to multiply two numbers using only an adder and memory — long multiplication, worked out recursively.

A book-like walkthrough of parabolas, ellipses and hyperbolas, with derivations and visual diagrams for each.

A CRT-terminal puzzle game that teaches ANSI/VT100 escape sequences by making you actually type them, mission by mission.

Solves and checks trigonometric equations step by step, on the unit circle.

Charts a full amortization schedule — every EMI, and how much of each is principal versus interest.

Estimates pi by scattering random points inside a square and counting how many land in the circle.

Converts numbers between binary, octal, decimal and hexadecimal — arithmetic in any base but ten.

Weighs the true cost of a bank loan against borrowing from a relative, interest laid out side by side.

Turns any name into a numeric code and back — a small letter-to-number cipher, built for fun.

Grade calculator for classes IX and X — enter your marks and see the result before the report card does.

A quick-fire arithmetic quiz against the clock — for killing time a little more productively.

A new-tab home page — pick an engine, one search box, nothing else competing for your attention.