Turn your addition worksheets into flashcards up to 20
Skip the printable packs. Upload a worksheet, a photo of a page or your own notes, and DeckOwl builds flashcards with spaced repetition.
Why make your own addition to 20 flashcards
Printable addition sheets cover the facts to 20, but they cannot adapt to the sums your child keeps missing. DeckOwl takes your own worksheet, a photo of the page, or class notes and turns them into addition to 20 math flash cards with spaced repetition, so the hard facts come back more often.
- Upload a photo of a worksheet and text recognition reads the problems.
- Group cards by strategy, such as doubles, make-a-ten, and counting on.
- Shuffle decks so the answers are not learned by their position on the page.
- The free plan includes 3 generations per month; Plus adds unlimited generations and PDF export.
Photo to flashcards
Snap a worksheet or upload a PDF, DOCX, PPTX or notes, and the sums become cards.
Spaced repetition
Cards you miss come back sooner, so facts to 20 stick without rereading the same page.
Quizzes too
Turn the same material into multiple choice or true/false quizzes with explanations.
How it works
Add your material
Upload a PDF, DOCX, PPTX, notes, or a photo of a page.
Generate the deck
DeckOwl writes flashcards from the sums and facts it finds in your material.
Study a little each day
Review in the browser on the free plan, or export to Anki with Plus.
Start with the facts that unlock the rest. Doubles like 6 + 6 and make-a-ten sums like 9 + 6 cover a large share of the range to 20, so a first deck can focus there and grow as accuracy improves. Keep decks short and review them for a few minutes each day rather than in one long session.
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Frequently asked questions
Which addition facts to 20 should a child learn first?
Most early learners start with doubles like 4 + 4 and make-a-ten facts like 9 + 6 before working through the rest of the sums to 20. Keep each deck to about 10 to 15 cards so practice stays focused.
How do I stop practicing addition flash cards in order?
Shuffle the deck and include sums in both orders, such as 4 + 9 and 9 + 4, so the learner recalls the fact instead of the card's position. Spaced repetition also brings back the cards that are missed most often.
Can I print these flashcards?
PDF export is a Plus feature, available for $39/year or $7.99/month. The free plan lets you study the cards in the browser, with 3 generations per month.
Is there a free plan?
Yes. The free plan includes 3 generations per month and browser study, and no credit card is needed to start. Students with a school email get 40% off paid plans.
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