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Turn your worksheets into addition and subtraction flashcards to 20

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How to practice addition and subtraction to 20

A printed sheet of sums gives a child one pass at the problems, but practice sticks when the same facts return at spaced intervals. DeckOwl builds addition and subtraction flashcards to 20 from the material you already use, such as a photo of a teacher's worksheet or typed notes, so the cards match the exact problems your child is working on.

Mix addition and subtraction on the same card so kids learn to choose the operation.
Include fact families like 3 + 9 = 12 and 12 − 9 = 3 to show how the two operations connect.
Start with doubles and making 10, then move on to subtraction within 10 and facts that cross 10.
Keep each session to about ten minutes and review the cards due each day.

Example addition and subtraction facts to 20

What is 8 + 7?15. Make 10 first by taking 2 from the 7, which leaves 8 + 2 = 10 and 5 more, so 15.

What is 14 − 6?8. Count back 6 from 14, or think of the missing addend: 6 + 8 = 14.

What is 20 − 9?11. Subtract 10 to get 10, then add 1 back because you subtracted 1 too many.

What is 5 + 9?14. Move 1 from the 5 to the 9 to make 10, then add the remaining 4 to get 14.

What is 17 − 8?9. Subtract 7 first to reach 10, then subtract 1 more to reach 9.

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Reads your sheets

Upload PDFs, slides, Word files, notes or photos of a worksheet. Text recognition pulls the problems out for you.

Spaced repetition

Cards you miss come back sooner, and cards you know move to longer gaps between reviews.

Quizzes too

Switch to multiple choice or true/false questions with explanations when the cards start to feel easy.

How it works

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Add a worksheet photo, a PDF, or a typed list of the facts you want to practice.

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DeckOwl writes question and answer cards from the content you provided.

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Review in your browser on the free plan. The Plus plan adds PDF, DOCX, Anki and CSV export.

Start with facts that cross 10, like 8 + 7 and 14 − 6, since those take a bit of strategy. Keep sessions short, around ten minutes, and review the cards that are due each day.

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Frequently asked questions

How many addition and subtraction flashcards should a child practice at once?

Start with 10 to 15 cards so the session stays short and manageable. Add more once the child answers most of them quickly.

What order should kids learn addition and subtraction facts to 20?

A common order starts with doubles and making 10, then moves to subtraction within 10 and facts that cross 10. Build the cards in that order so each step builds on the last.

Can I export these flashcards to Anki or print them?

Export to PDF, DOCX, Anki and CSV is part of the Plus plan, which costs $39 a year or $7.99 a month. The free plan lets you study the cards in your browser, with three generations per month.

Is there a free plan?

Yes. The free plan includes three generations per month and browser study, and no credit card is needed to start. Students with a school email get 40% off Plus.

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