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Turn your own number worksheets into printable flashcards

Ready-made number sheets rarely match what your child is practicing. Upload a worksheet, a photo of a page or your notes, and DeckOwl builds flashcards for the numbers you need, with spaced repetition built in.

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Drop files here or browsePDF, DOCX, PPTX, text or photos of your notes · several files with Plus

Free · First set needs no signup · Creates flashcards in seconds

Why a custom set beats a generic printable

Counting drills for numbers 1 to 20 work best when the cards match what a child is actually practicing. A generic printable number flashcards for 1 to 20 sheet may skip the numbers your child mixes up, or use a layout that does not match the worksheet at school.

Cards follow the exact numbers on your child's worksheet.
Photos of printed pages are read with text recognition.
Spaced repetition shows weak numbers more often.
Free plan includes 3 generations per month with browser study.

Example number 1 to 20 flashcards

What number comes after 14?15. Counting forward by one from any number gives the next number in the sequence.

How do you write twelve as a numeral?12. Number words map directly to numerals, so twelve is written with the digits 1 and 2.

Which number is one more than 19?20. Adding one to 19 makes a new ten, so the result is 2 tens and 0 ones.

How many tens and ones are in 17?1 ten and 7 ones. Teens are a ten plus the ones digit, which is why 17 reads as one ten and seven.

What is 8 + 6?14. Counting on from 8 by six more gives 14, or make 10 first by moving 2 from the 6.

Generate the full set

Built from your material

Upload a worksheet, slide or photo and get flashcards that match the exact numbers and wording on the page.

Spaced repetition

Cards you miss come back sooner, so the numbers that give trouble get more practice without extra effort.

Print or export on Plus

Plus includes PDF export, so you can print a set. The free plan lets you study in the browser.

How it works

Upload your page

Add a PDF, a DOCX, a photo of a worksheet or typed notes covering numbers 1 to 20.

Generate the cards

DeckOwl turns the material into flashcards. Review them and remove any you do not need.

Study or print

Study in the browser for free, or upgrade to Plus to export a PDF you can print.

Starting from your own material fixes that. Upload the worksheet, a photo of a page or your notes, and DeckOwl writes one card per fact. Spaced repetition then brings back the numbers that are still shaky, so practice time goes to the right places.