Fast-reaction games that sharpen mental processing speed and attention under time pressure.
Other benefits:
Boost Memory Mind Sharpness Strong Mind Smart Mathematician Rare Maths
Two and three-digit numbers
Three and four-digit numbers
Large numbers at speed
Round to one or two decimals
Fractions, decimals and percentages
The odd one is only a hundredth away
No time pressure, clear differences
Everything as a percentage
Straight number comparison
Fractions against decimals
Cross-multiply to decide
All representations at once
Estimate a multiplication
Estimate big additions
Estimate a quotient
Estimate a percentage of a number
A gentle first grid
The classic range
Where the tricks matter
Thirty seconds, small grid
Ten timed arithmetic questions that get harder as you go.
Race the clock through rapid-fire questions.
Mixed operations against a countdown.
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.