Turn your own addition worksheet into flashcards to 20
Printable packs use sums that may not match what your child is practicing this week. DeckOwl builds cards from the exact worksheet, notes or photo you already have.
Why generate your own addition cards
Printable sheets of addition flashcards to 20 are easy to find, but they rarely match the sums a child is practicing this week. A custom set keeps the practice tied to the worksheet or lesson in front of them.
- Cards drawn from your own worksheet or lesson, not a generic list
- Make-ten and doubles included when they appear in your source
- Spaced repetition so missed sums return more often
- Study in the browser on the free plan, with exports on Plus
Built from your material
Upload a PDF, slide deck, typed notes or a photo of a worksheet, and the cards follow your own problems.
Spaced repetition
Cards you miss come back sooner, and the ones you know are spaced further apart, so the facts stick.
Quick to start
Create a set in minutes and study in the browser. No credit card is needed to begin.
How it works
Upload the source
Add a worksheet, a page from a workbook or a list of sums to 20 as a PDF, image or text.
Generate the cards
DeckOwl reads the problems and writes one flashcard per fact, with the answer on the back.
Practice until they stick
Study a short set each day and let spaced repetition bring back the facts that need work.
Start with make-ten facts like 9 + 6 and doubles like 7 + 7, because they unlock many other sums. Once those are quick, the remaining facts are easier to learn in small groups.
Upload the material your child already uses, review the generated cards together, and keep sessions short. Ten to fifteen minutes a day usually works better than one long drill.
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Frequently asked questions
How many addition facts to 20 should a child practice at once?
Most children do better with a small set of 10 to 15 cards and frequent repeats than with every sum at once. Start with the facts they miss most and add new ones as those become quick.
What is the best way to memorize sums to 20?
Learn make-ten facts and doubles first, then use them to work out the rest. Saying the answer aloud and checking it right away helps more than rereading a list.
Can I export these flashcards to print them?
Exporting, including PDF, is a Plus feature at $99.90 a year or $9.99 a month. The free plan lets you study the cards in your browser, with 3 generations per month.
Do I need a credit card to try DeckOwl?
No. You can start on the free plan without a credit card, and students get 40% off Plus with a school email.
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