Turn any worksheet into number flashcards up to 20
Printable sets are fine for a quick start, but flashcards built from your own counting sheets and classroom notes match what your learner is actually working on.
Why custom number cards beat generic sets
A child who can count to 10 often stumbles on the teen numbers, so number flashcards up to 20 work best when they follow the exact skills being taught that week. Ready-made printable sets cover the basics, but they rarely match the worksheet coming home from school.
- Cards built from your own worksheets, not a generic list
- Practice for counting, comparing, and place value up to 20
- Spaced repetition to focus on numbers that are still shaky
- Study in the browser on the free plan, with exports on paid plans
Upload what you already have
Add a PDF worksheet, a slide from class, a photo of a page, or typed notes. Text in photos is read automatically.
Cards that repeat at the right time
Spaced repetition brings back the numbers a learner is still mixing up, such as 13 and 30, more often than the ones they already know.
Study in the browser
Practice on a phone, tablet, or laptop with no app to install. The free plan includes three generations each month.
How it works
Add your material
Upload a PDF, DOCX, PPTX, text file, or image that covers numbers 1 to 20.
Generate the flashcards
DeckOwl writes question and answer cards from the content, including counting, comparing, and place value.
Practice on a schedule
Study the cards in short sessions and let spaced repetition decide which numbers need another review.
DeckOwl builds cards from your own material, so the questions reflect your lesson. If a worksheet focuses on ten plus some ones, the cards will test that. If it covers greater than and less than, you get those instead.
Start by recognizing numbers, then move to comparing and combining them. Review in short sessions and check which cards keep coming back.
Explore related topics
Printable Number Flashcards 1 to 20
Make 1-20 number flashcards from your own worksheet or photo. Start free, no card needed.
Printable 1-20 Number Flashcards
Make 1 to 20 number flashcards from your own worksheets or photos to study or print.
Number Flashcards 1-20 With Pictures
Make number flashcards 1 to 20 with pictures from your own worksheet or photo.
Kindergarten number flashcards 1-20
Build picture flashcards for counting 1 to 20 from your own kindergarten worksheets.
Number Flashcards 1-20 From Your Materials
Turn a worksheet or number chart into 1-20 flashcards with spaced repetition.
Number Flashcards 1-20 with Pictures
Make picture flashcards for numbers 1 to 20 from your own PDF or worksheet.
Number Flashcards 1-20 With Pictures
Picture flashcards for numbers 1 to 20, built from your own PDFs or photos.
Number Flashcards to 20 Made From Your Pages
Custom flashcards for numbers 1 to 20, built from your own worksheet, notes or photo.
Frequently asked questions
Which numbers from 1 to 20 should a child learn first?
Start with 1 to 10 so the pattern of counting is firm. Then move to 11 to 20, where the ten plus ones pattern is the key idea.
How many number cards should a child practice at once?
A short set of about 10 cards works well for a few minutes at a time. Repeating small sets across several days usually helps more than one long session.
Can I export the flashcards as a printable PDF?
PDF export is available on the Plus plan at $39 per year or $7.99 per month. The free plan lets you study the cards in the browser with three generations each month.
Do I need a credit card to start?
No. You can start on the free plan without a credit card, and students with a school email get 40% off paid plans.
Keep exploring the topic
Review the main ideas visually or practice recalling them.
Custom Pub Quiz from Your Notes
Skip the generic deck. Turn your own slides or notes into a trivia quiz with answers.
SAT Practice Test From Your Notes
Upload SAT prep notes or PDFs and get a practice quiz with explanations for every answer.
Friendly Letter Mind Map Examples
Five branches covering each part of a friendly letter, plus a way to build your own map.
AI Mind Map Template From Your Notes
Generate an editable mind map from your own PDF or notes, not a generic template.