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Help & guides

Get faster, the right way.

20 short, practical guides on training mental arithmetic — the techniques, the learning science, and how to measure progress. Each one is organised as plain questions and answers.

Fundamentals

04
How can I get faster at mental math?
What actually makes you fast — and a practical plan to get there.
3 min read→
What is number sense and how do I build it?
The foundation every fast calculator builds on, and how to train it.
4 min read→
How does working memory affect mental math — and can I expand it?
Why you lose your place mid-calculation, and what actually helps.
3 min read→
Why should I calculate left to right?
Drop the school algorithm and calculate the way your brain prefers.
3 min read→

Techniques

08
What are the best strategies for adding in your head?
Make tens, round and adjust, and add the fast way.
3 min read→
How do I subtract quickly in my head?
Count up, use complements, and stop borrowing in your head.
3 min read→
What are the fastest multiplication tricks?
The ×5, ×9, ×11 and doubling shortcuts worth memorizing.
3 min read→
How do I multiply two-digit numbers in my head?
Break big products into pieces you can actually hold.
3 min read→
How can I divide numbers mentally?
Turn division into multiplication you already know.
3 min read→
How do I square numbers in my head?
Square anything ending in 5 instantly, plus the near-base trick.
3 min read→
What's the best way to memorize the times tables?
Spend your effort on the facts that actually trip you up.
4 min read→
How do I estimate and round quickly?
Get a fast, close-enough answer — and catch your mistakes.
3 min read→

Learning Science

04
How does spaced repetition help me learn math facts?
Why spacing your practice beats cramming, and how to apply it.
3 min read→
Why is recalling better than re-reading?
Recall beats review. The science, and how to use it.
3 min read→
How do I overcome math anxiety and time pressure?
Calm the nerves that eat the working memory you need to calculate.
3 min read→
How do I build a practice habit that sticks?
Tiny daily reps that actually stick — and compound.
4 min read→

Practice & Progress

03
How can I check my answers quickly?
Last-digit, parity, and casting out nines as instant sanity checks.
3 min read→
How should I track my progress?
The metrics that matter, and how to read your trend.
3 min read→
Why have I stopped improving — and how do I break through?
Stuck at the same score? Here's how to start climbing again.
3 min read→

Everyday Math

01
How do I use mental math in everyday life?
Tips, discounts, splits and budgets — math you'll use today.
3 min read→