Practice mental math with flashcards made from your own notes
Upload a worksheet, slides or notes and get flashcards you can review in your browser. Spaced repetition brings back the problems you miss so quick calculation becomes automatic.
Drill mental math daily with flashcards you control
Quick mental arithmetic improves with short, frequent practice, and mental math flashcards online make that practice easy to repeat. You can drill tricks like multiplying by 11 or finding 25 percent of a number in a few minutes before class or work.
- Multiply by 11 by placing the sum of the two digits between them.
- Find 10 percent by moving the decimal one place to the left.
- Square numbers ending in 5 by multiplying the tens digit by the next integer and appending 25.
- Round to friendly numbers, then correct by the amount you rounded.
Cards from your material
Upload a PDF, DOCX, slides, plain notes or a photo of a page. Text recognition reads the problems and strategies so you can study them as flashcards.
Spaced repetition
Cards you miss come back sooner and the ones you know fade into longer intervals, so daily practice stays focused on your weak spots.
Study in the browser
Practice on any computer with a browser. The free plan lets you study in the browser, and Plus adds PDF, DOCX, Anki and CSV export.
How it works
Add your problems
Upload a worksheet, a page from your textbook, or a list of strategies you want to drill.
Review the generated cards
Check the flashcards for accuracy and edit any that need a clearer question or answer.
Practice a few minutes a day
Study in short sessions and let spaced repetition schedule the cards you are most likely to forget.
Most people already have useful material: a teacher's handout, a test prep book, or their own notes on shortcuts. DeckOwl turns that material into flashcards, so you practice the exact methods your course uses instead of random problems.
Spaced repetition handles the scheduling. Each card returns at a time chosen from how well you recalled it, which keeps sessions short and steadily builds speed.
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Frequently asked questions
How many mental math problems should I practice each day?
Short daily sessions of about 10 to 20 focused problems usually work better than one long session. Consistent recall helps the methods become automatic.
What is the fastest way to get better at mental multiplication?
Learn a few reliable shortcuts first, such as multiplying by 11, 5 and 25, and practice each until you can explain the steps out loud. Then mix them with harder problems.
Is DeckOwl free to use?
Yes, the free plan includes 3 generations per month and studying in the browser, and no credit card is needed to start. Exporting requires a paid plan.
Can I export mental math flashcards to Anki?
Yes, the Plus plan at $99.90 per year or $9.99 per month includes export to Anki, plus PDF, DOCX and CSV export. Students get 40 percent off with a school email.
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