Free your arithmetic from pen and paper — and let your brain run at calculator speed
11 speed-maths techniques across maths, physics and chemistry. Each one comes with the rule, a worked derivation, a live demo, a practice set, and a way to test it under time pressure. Learn it once, keep it for life.
Free to startRuns in your browser中文 / English
What you can do here
- 11 structured techniques — from multiplying by 11 to flagpole division
- 8 practice modes with unlimited locally generated questions
- Timed tests graded S–D, plus three 45-second games
- One-click language switch — the whole UI in English or 中文
- Your own account — registration data is stored in Supabase
Maths core, physics and chemistry speed tricks.
Pick a technique and a level, get 10 questions.
Timed tests tell you which step is still shaky.
Square Dash, DS true/false, Number Sprint.
The 11 lessons
Work through them in order if you are new. Each lesson is short: the rule, one worked example, then practice.
DS Digital Root Check
Catch a wrong answer in two seconds, without redoing the work.
2Multiplying by 11
First digit, neighbour sums, last digit — with carries handled on the fly.
3LR Addition & Subtraction
Left to right, the way numbers are actually spoken.
4LR Multiplication & Splitting
Split, round, refactor — pick the cheapest route to the product.
5Fast Squaring
Ends in 5, or near a round number: two rules cover almost everything.
6The Bridge Method
Two-digit products in one pass: first, cross, last.
7The Vitruvian Man Method
Split a big multiplication into pieces your working memory can hold.
8The UT Method
Units and tens in two lanes, merged at the end.
9FP Flagpole Division
Long division without the writing — a flag column and a running remainder.
10Physics Speed Tricks
Dimensional checks, special values, graphs, ratios and constants.
11Chemistry Speed Tricks
Conservation, difference, average value, unified mole method.
Learn → practise → test → play
Learn
Read the rule and follow the derivation step by step until you can say it out loud.
Open the learning centrePractise
Ten questions per set, unlimited sets, generated in your browser. Aim below three seconds per question.
Start practisingTest
60, 120 or 180 seconds. The report tells you which technique is not yet automatic.
Take a timed testAbout this deployment
This is a demo site. Lessons, drills and games run entirely in your browser. Account registration is real and is stored in Supabase; the paid plans are display-only — there is no payment gateway and no charge of any kind. Prices shown are example copy.