The problem
You reread the proof, and on test day the formula will not come.
Rereading a proof feels like mastering it. Being asked for it cold, three days later, proves otherwise. In mathematics the gap is stark: between recognising an identity and producing it under pressure lies the whole exercise.
Notation typeset, not typed
A fraction shows as a fraction, an integral carries its bounds, an exponent stays an exponent. You revisit the formula as it is written on the board.
Multiple choice against sign traps
Four derivatives offered, one correct: this shape flushes out the sign and exponent confusions a two-sided card lets through, because finding your answer roughly right is enough there.
Fluency is kept up in short bursts
A binomial identity is revisited for two minutes every ten days, not for two hours the night before. The recall schedule picks the moment, card by card.
From your notes to cards
One page of exercises, three cards.
You upload the chapter. Here are three of the cards it produces, in their real rendering.
Uploaded excerpt · chapter 4, exercises
In a right-angled triangle, the square of the hypotenuse equals the sum of the squares of the other two sides. Find the area under the curve of x² between 0 and 1. Differentiate f(x) = x³.
gives
Two-sided
Pythagorean theorem — the relation between the three sides
where c is the hypotenuse
Formula
Evaluate this integral
Multiple choice
Derivative of f(x) = x³
3x²
x²
x³/3
3x
The right shapes
The shapes that work in maths
Six card shapes exist in the app. Three carry most of a mathematics syllabus.
Formula
Because the notation is typeset, this is the only shape that can demand an exact expression without distorting it.
Multiple choice
Four very close options force a decision, where an answer worked out in your head would have settled for being vaguely right.
Two-sided
For theorem statements and their conditions of use, which must be quoted rather than recognised.
Your sources
Where your maths cards come from
The problem sheet, the photo of the board, the chapter slides: seven ways in, and no typing by hand.
PDF
A chapter, a handout, a past paper with answers.
Word
Your own notes, in .doc as well as .docx.
PowerPoint
The lecture deck, exactly as you were given it.
Photo of your notes
The whiteboard or your notebook, as JPG or PNG.
YouTube video
An online lecture, straight from its address.
Pasted text
Three paragraphs are enough to make a deck.
Anki import
Your old deck finds its place again, in its own window.
On exam day
Up to test day
You set the date of the paper: the plan tightens around it and the shakiest chapters move to the front. Because the school calendar is built in, a holiday weekend is not asked for three hours of integrals. The method, in detail →
Frequently asked questions
Does Memojin really handle LaTeX?
Yes. Notation is typeset inside the card by KaTeX, the engine the card editor and the review sessions already rely on. A fraction shows as a fraction, not between two dollar signs.
Can I revise entire proofs?
Yes, provided you cut them up. A proof is retained through its steps: each becomes a card, and the order of the steps becomes a card of its own. That works better than a single card carrying two pages.
Do calculation exercises fit on a card?
A calculation fits when its answer is short and exact: an antiderivative, a limit, a derivative. For a long problem, the card carries the method and the starting point, not the three pages of working.
What about a photo of my notebook?
Yes, as JPG or PNG, and it is the fastest route for a board copied out by hand. With cramped handwriting, a quick read-through of the cards produced is still worth it before you revise them.
Explore the other subjects
Physics
Laws with their units, and orders of magnitude that hold.
Chemistry
Balanced equations intact, nomenclature kept up.
Biology
The diagram inside the question, labels to produce.
History
Dates produced rather than recognised, and causes put back in order.
Geography
The map in the prompt, landmarks to name.
Languages
Vocabulary you hear, conjugation you match.
Literature
Quotations restored word for word, devices named.
Philosophy
Concepts defined, distinctions held, authors attached.
Economics
Mechanisms explained, indicators known, schools placed.
Computer science
Technical vocabulary and complexities, not keyboard practice.
Law
Provisions cited right, conditions stated in full.
These twelve pages are examples, not a list: every other subject works the same way. Every subject →
Your formulas deserve better than a photo of a notebook.
Create a free account →Free, no card required