Turn worksheets into addition and subtraction flashcards up to 20
Printed sheets give you the same problems every time. Upload your own worksheet, notes or photo of a page and get flashcards you can review until the facts stick.
Why custom cards beat a generic printable set
Many teachers and parents look for addition and subtraction flashcards up to 20 because a child needs quick recall of facts within ten and then within twenty. A printable set works, but it cannot match the exact problems on this week's homework or the strategies your child's class is using.
- Upload a worksheet, photo or notes instead of printing a generic deck.
- Cards repeat the sums that are missed, so practice stays focused.
- Quizzes with explanations show why an answer is right, not only what it is.
- Export to Anki or PDF is available on the Plus plan.
Built from your material
Upload a PDF, slide deck, text notes or a photo of a worksheet and DeckOwl turns the problems into flashcards.
Spaced repetition
Cards you miss come back sooner, and facts you know well are spaced further apart so practice time goes to the hardest sums.
Quizzes and mind maps too
Switch from flashcards to multiple choice or true/false quizzes with explanations, or map how addition and subtraction connect.
How it works
Upload your sheet
Add a PDF, DOCX, PPTX, notes file or a photo of the worksheet. Photos are read with text recognition.
Generate your cards
DeckOwl creates question-and-answer flashcards from the problems in your material.
Study in the browser
Review the cards with spaced repetition. Free accounts can study online without a credit card.
Start with the sheet your child already has. Generate cards from it, then review them in short sessions. Missed facts return more often, so the practice focuses on the sums that still slow down your child.
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Frequently asked questions
How do I practice addition and subtraction within 20 with flashcards?
Keep sessions short, about 10 to 15 minutes, and say each fact aloud before you flip the card. Sort the cards you miss into a pile and review that pile first the next day.
Why does making a ten help with sums up to 20?
Making a ten means rewriting one addend so the other reaches 10, such as 7 + 8 becoming 10 + 5. Knowing the ten facts well makes most sums up to 20 faster to solve.
Can I export these cards to Anki or print them?
Exports to PDF, DOCX, Anki and CSV are part of the Plus plan. The free plan lets you study the cards in the browser.
Do I need a credit card to start?
No. You can start on the free plan, which includes 3 generations per month, without adding a credit card.
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