Addition Facts 0–20 Flash Cards — 231 Free Printable Cards (Sums to 20)
Addition facts to 20 are the 231 facts where both numbers and the sum are 20 or less, from 0 + 0 = 0 to 20 + 0 = 20. Each card has the question on the front and the answer on the back, lined up for double-sided printing, and the set is free to print.
Watch how it works (video: Print math fact flash cards)1:06“Print” opens these 231 cards in the flash card maker as an editable list: choose 2 to 9 cards a page, drop any facts you don’t need, and download the PDF. “Practice online” opens our 0–12 addition deck to flip through in the browser; the first 30 cards are free to play.
All 231 addition facts 0–20
0 + 0 to 0 + 20 (21)
- 0 + 0 = 0
- 0 + 1 = 1
- 0 + 2 = 2
- 0 + 3 = 3
- 0 + 4 = 4
- 0 + 5 = 5
- 0 + 6 = 6
- 0 + 7 = 7
- 0 + 8 = 8
- 0 + 9 = 9
- 0 + 10 = 10
- 0 + 11 = 11
- 0 + 12 = 12
- 0 + 13 = 13
- 0 + 14 = 14
- 0 + 15 = 15
- 0 + 16 = 16
- 0 + 17 = 17
- 0 + 18 = 18
- 0 + 19 = 19
- 0 + 20 = 20
1 + 0 to 1 + 19 (20)
- 1 + 0 = 1
- 1 + 1 = 2
- 1 + 2 = 3
- 1 + 3 = 4
- 1 + 4 = 5
- 1 + 5 = 6
- 1 + 6 = 7
- 1 + 7 = 8
- 1 + 8 = 9
- 1 + 9 = 10
- 1 + 10 = 11
- 1 + 11 = 12
- 1 + 12 = 13
- 1 + 13 = 14
- 1 + 14 = 15
- 1 + 15 = 16
- 1 + 16 = 17
- 1 + 17 = 18
- 1 + 18 = 19
- 1 + 19 = 20
2 + 0 to 2 + 18 (19)
- 2 + 0 = 2
- 2 + 1 = 3
- 2 + 2 = 4
- 2 + 3 = 5
- 2 + 4 = 6
- 2 + 5 = 7
- 2 + 6 = 8
- 2 + 7 = 9
- 2 + 8 = 10
- 2 + 9 = 11
- 2 + 10 = 12
- 2 + 11 = 13
- 2 + 12 = 14
- 2 + 13 = 15
- 2 + 14 = 16
- 2 + 15 = 17
- 2 + 16 = 18
- 2 + 17 = 19
- 2 + 18 = 20
3 + 0 to 3 + 17 (18)
- 3 + 0 = 3
- 3 + 1 = 4
- 3 + 2 = 5
- 3 + 3 = 6
- 3 + 4 = 7
- 3 + 5 = 8
- 3 + 6 = 9
- 3 + 7 = 10
- 3 + 8 = 11
- 3 + 9 = 12
- 3 + 10 = 13
- 3 + 11 = 14
- 3 + 12 = 15
- 3 + 13 = 16
- 3 + 14 = 17
- 3 + 15 = 18
- 3 + 16 = 19
- 3 + 17 = 20
4 + 0 to 4 + 16 (17)
- 4 + 0 = 4
- 4 + 1 = 5
- 4 + 2 = 6
- 4 + 3 = 7
- 4 + 4 = 8
- 4 + 5 = 9
- 4 + 6 = 10
- 4 + 7 = 11
- 4 + 8 = 12
- 4 + 9 = 13
- 4 + 10 = 14
- 4 + 11 = 15
- 4 + 12 = 16
- 4 + 13 = 17
- 4 + 14 = 18
- 4 + 15 = 19
- 4 + 16 = 20
5 + 0 to 5 + 15 (16)
- 5 + 0 = 5
- 5 + 1 = 6
- 5 + 2 = 7
- 5 + 3 = 8
- 5 + 4 = 9
- 5 + 5 = 10
- 5 + 6 = 11
- 5 + 7 = 12
- 5 + 8 = 13
- 5 + 9 = 14
- 5 + 10 = 15
- 5 + 11 = 16
- 5 + 12 = 17
- 5 + 13 = 18
- 5 + 14 = 19
- 5 + 15 = 20
6 + 0 to 6 + 14 (15)
- 6 + 0 = 6
- 6 + 1 = 7
- 6 + 2 = 8
- 6 + 3 = 9
- 6 + 4 = 10
- 6 + 5 = 11
- 6 + 6 = 12
- 6 + 7 = 13
- 6 + 8 = 14
- 6 + 9 = 15
- 6 + 10 = 16
- 6 + 11 = 17
- 6 + 12 = 18
- 6 + 13 = 19
- 6 + 14 = 20
7 + 0 to 7 + 13 (14)
- 7 + 0 = 7
- 7 + 1 = 8
- 7 + 2 = 9
- 7 + 3 = 10
- 7 + 4 = 11
- 7 + 5 = 12
- 7 + 6 = 13
- 7 + 7 = 14
- 7 + 8 = 15
- 7 + 9 = 16
- 7 + 10 = 17
- 7 + 11 = 18
- 7 + 12 = 19
- 7 + 13 = 20
8 + 0 to 8 + 12 (13)
- 8 + 0 = 8
- 8 + 1 = 9
- 8 + 2 = 10
- 8 + 3 = 11
- 8 + 4 = 12
- 8 + 5 = 13
- 8 + 6 = 14
- 8 + 7 = 15
- 8 + 8 = 16
- 8 + 9 = 17
- 8 + 10 = 18
- 8 + 11 = 19
- 8 + 12 = 20
9 + 0 to 9 + 11 (12)
- 9 + 0 = 9
- 9 + 1 = 10
- 9 + 2 = 11
- 9 + 3 = 12
- 9 + 4 = 13
- 9 + 5 = 14
- 9 + 6 = 15
- 9 + 7 = 16
- 9 + 8 = 17
- 9 + 9 = 18
- 9 + 10 = 19
- 9 + 11 = 20
10 + 0 to 10 + 10 (11)
- 10 + 0 = 10
- 10 + 1 = 11
- 10 + 2 = 12
- 10 + 3 = 13
- 10 + 4 = 14
- 10 + 5 = 15
- 10 + 6 = 16
- 10 + 7 = 17
- 10 + 8 = 18
- 10 + 9 = 19
- 10 + 10 = 20
11 + 0 to 11 + 9 (10)
- 11 + 0 = 11
- 11 + 1 = 12
- 11 + 2 = 13
- 11 + 3 = 14
- 11 + 4 = 15
- 11 + 5 = 16
- 11 + 6 = 17
- 11 + 7 = 18
- 11 + 8 = 19
- 11 + 9 = 20
12 + 0 to 12 + 8 (9)
- 12 + 0 = 12
- 12 + 1 = 13
- 12 + 2 = 14
- 12 + 3 = 15
- 12 + 4 = 16
- 12 + 5 = 17
- 12 + 6 = 18
- 12 + 7 = 19
- 12 + 8 = 20
13 + 0 to 13 + 7 (8)
- 13 + 0 = 13
- 13 + 1 = 14
- 13 + 2 = 15
- 13 + 3 = 16
- 13 + 4 = 17
- 13 + 5 = 18
- 13 + 6 = 19
- 13 + 7 = 20
14 + 0 to 14 + 6 (7)
- 14 + 0 = 14
- 14 + 1 = 15
- 14 + 2 = 16
- 14 + 3 = 17
- 14 + 4 = 18
- 14 + 5 = 19
- 14 + 6 = 20
15 + 0 to 15 + 5 (6)
- 15 + 0 = 15
- 15 + 1 = 16
- 15 + 2 = 17
- 15 + 3 = 18
- 15 + 4 = 19
- 15 + 5 = 20
16 + 0 to 16 + 4 (5)
- 16 + 0 = 16
- 16 + 1 = 17
- 16 + 2 = 18
- 16 + 3 = 19
- 16 + 4 = 20
17 + 0 to 17 + 3 (4)
- 17 + 0 = 17
- 17 + 1 = 18
- 17 + 2 = 19
- 17 + 3 = 20
18 + 0 to 18 + 2 (3)
- 18 + 0 = 18
- 18 + 1 = 19
- 18 + 2 = 20
19 + 0 to 19 + 1 (2)
- 19 + 0 = 19
- 19 + 1 = 20
20 + 0 (1)
- 20 + 0 = 20
Tips for learning addition facts 0–20
- Make ten: 8 + 5 is 8 + 2 (ten) plus 3 more, 13.
- Doubles and near doubles: 6 + 6 = 12, so 6 + 7 is one more, 13.
- Adding 9 is adding 10 and taking one away: 9 + 7 is 17 − 1 = 16.
How many pages the 231 cards print on
The answers print on the back. The PDF puts an answer page straight after each page of questions, so printed double-sided, each sheet of paper has questions on one side and their answers on the other.
| Cards per page | Pages in the PDF | Sheets of paper, double-sided | Good for |
|---|---|---|---|
| 2 per page — extra large | 232 | 116 | Whole-class flashing from the front of the room. |
| 4 per page — large | 116 | 58 | Small group work and pocket charts. |
| 6 per page — standard | 78 | 39 | The usual choice. Fits a rubber band. |
| 8 per page — compact | 58 | 29 | Fact decks and word rings. |
| 9 per page — small | 52 | 26 | Big decks where paper matters. |
Printing the answers on the back
- Open the print dialog and turn on two-sided (duplex) printing.
- Choose flip on long edge (sometimes called long-edge binding). The pages are portrait, and each answer page reverses the order of every row, so the answer to the top-left card prints behind the top-left card.
- Don’t pick “flip on short edge” — it puts the answers behind the wrong cards.
- Print the first sheet, hold it up to a window to check, then print the rest and cut.
No duplex printer? Turn the answer backs off in the maker and print fronts only, or print the odd pages, put the stack back in the tray, and print the even pages. Printers feed differently, so test with one sheet first.
More math fact flash cards
Addition Facts 0–20 flash cards — questions people ask
How many addition facts are there to 20?
231, counting 3 + 5 and 5 + 3 as two cards. These are every pair of whole numbers from 0 to 20 whose sum is 20 or less.
What does "addition facts 0–20" mean on this page?
Facts within 20: both numbers and the sum stay between 0 and 20. So 13 + 7 = 20 is in, and so is 9 + 9 = 18.
Which grade learns addition facts to 20?
In the Common Core, second grade is expected to add and subtract fluently within 20 and to know all sums of two one-digit numbers from memory by the end of the year.
Are there any negative answers?
No — every card is addition of whole numbers, so every answer is 0 or more.
How many pages do the addition facts 0–20 flash cards print on?
231 cards. At 6 cards per page that is 39 sheets of paper printed double-sided (78 pages in the PDF); at 9 per page it is 26 sheets. Two cards a page makes big cards for the front of the room; nine a page saves paper.
How do I print the answers on the back?
Print double-sided and choose "flip on long edge" (some printers call it long-edge binding). Each answer page reverses the order of every row, so when the sheet flips, every answer lands behind its own question. Flipping on the short edge puts answers behind the wrong cards, so check one sheet before you cut.
Can I take out the facts my child already knows?
Yes. The "Print 231 flash cards" button opens the deck in the flash card maker as an editable list, one fact per line. Delete the lines you don't need, or add your own, before you print.
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