Vedic maths, Roman numerals, binary, modular arithmetic and other roads less travelled.
Other topics:
Arithmetic Games Fractions & Percentages Logic & Puzzle Games Number Theory Games Speed & Reflex Games Rare & Unusual Maths
Roman to digits, up to 100
Digits to Roman, up to 1000
Read the date off the credits
The full range to 3,999
Read binary numbers
Write binary numbers
Base sixteen, the colour-code base
Base eight and mixed conversions
The easiest sutra to learn
25², 35², 85² instantly
Nikhilam: multiply using deficits
Two-digit multiplication in one line
The classic wrap-around
Timetable time
What day will it be?
Remainders as a topic in themselves
Every game on YogiCalc is free, runs entirely in your browser, needs no sign-up and saves your best score on your own device. Nothing is uploaded anywhere. They work on a phone, a tablet or a computer.
Looking for something else? The full games library lists all 110 games, and the calculator library covers finance, tax, health and conversion.