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Turn your lecture notes into number flashcards with AI

Paste notes, upload slides or photograph a worksheet. DeckOwl builds number flashcards with spaced repetition, so the figures stay with you after the lecture ends.

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Drop files here or browsePDF, DOCX, PPTX, text or photos of your notes · several files with Plus

Free account · 3 sets a month · Creates flashcards in seconds

Why number facts need repetition more than another video

A recorded lecture on place value or times tables moves quickly, and the numbers are the first thing to slip. If you want video-based number flashcards, DeckOwl works from text rather than clips: paste your notes, upload slides or photograph a worksheet, and it produces number flashcards you can review with spaced repetition. It does not generate a video or pull frames from one.

Upload slides, notes or a photo of a worksheet as your source
Get front-and-back cards for the figures your course stresses
Review with spaced repetition so repeated facts stick
Export to Anki or CSV on the Plus plan when you need it elsewhere

Example number flashcards for math and Spanish basics

What is 7 in Roman numerals?VII. Roman numerals use I, V, X, L, C, D and M, and smaller symbols placed before larger ones are subtracted.

Which numbers from 1 to 20 are prime?2, 3, 5, 7, 11, 13, 17 and 19. A prime has exactly two factors, 1 and itself.

How do you say 47 in Spanish?Cuarenta y siete. Numbers from 31 to 99 combine the tens word, y, and the units word.

What is the square root of 144?12. Because 12 times 12 equals 144, so 144 is a perfect square.

What is 3/8 as a decimal?0.375. Divide the numerator 3 by the denominator 8 to get the decimal form.

Generate the full set

Cards from your own material

Upload a PDF, PPTX, DOCX, plain notes or a photo of a page. The cards come from the text you provide.

Spaced repetition

Cards you miss come back sooner, and cards you know are spaced further apart, so number facts stay in memory.

Study in the browser

The free plan gives you 3 generations a month with browser study. Plus adds unlimited generations and exports.

How it works

Add your source

Paste your notes or upload the slides, PDF or photographed worksheet that covers the numbers you need.

Generate the cards

DeckOwl reads the text and writes front-and-back flashcards for the key figures, rules and conversions.

Review on a schedule

Study the deck in the browser. Spaced repetition brings back the cards you are most likely to forget.

Start with the figures your instructor repeats most, such as multiplication facts, prime numbers, and common fraction and decimal pairs. Keep each deck focused on one topic, since a long set of similar numbers is harder to review and easier to confuse. Review a short set daily rather than a long set once a week.

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Frequently asked questions

How many number flashcards should I make for one lecture?

Aim for the 15 to 30 facts your instructor emphasized, since a very long deck of similar numbers is harder to review. Split larger topics into sets of about 20 so each session stays manageable.

Which number facts are worth memorizing first?

Start with facts you use in almost every problem, such as multiplication up to 12, primes under 20, and common fraction and decimal pairs. Add conversions like Roman numerals or number words in another language if your course covers them.

Can I export number flashcards to Anki?

Yes, Anki export is part of the Plus plan, which costs $99.90 a year or $9.99 a month. The free plan lets you study in the browser without exports.

Does DeckOwl make flashcard videos?

No. DeckOwl creates text flashcards from PDFs, slides, notes and images, and you study them in the browser or in an exported format on a paid plan.

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Keep exploring the topic

Review the main ideas visually or practice recalling them.