1 + 0Adding 0 changes nothing, so the answer is still 1.
2 + 0Adding 0 changes nothing, so the answer is still 2.
3 + 0Adding 0 changes nothing, so the answer is still 3.
4 + 0Adding 0 changes nothing, so the answer is still 4.
5 + 0Adding 0 changes nothing, so the answer is still 5.
6 + 0Adding 0 changes nothing, so the answer is still 6.
7 + 0Adding 0 changes nothing, so the answer is still 7.
8 + 0Adding 0 changes nothing, so the answer is still 8.
9 + 0Adding 0 changes nothing, so the answer is still 9.
10 + 0Adding 0 changes nothing, so the answer is still 10.
11 + 0Adding 0 changes nothing, so the answer is still 11.
12 + 0Adding 0 changes nothing, so the answer is still 12.
Show all 169 cards (156 more)
+ 1 13
0 + 10 adds nothing, so the answer is the other number, 1.
1 + 1Double 1: one and one more make 2.
2 + 1One more than 2 is the next number you count, 3.
3 + 1One more than 3 is the next number you count, 4.
4 + 1One more than 4 is the next number you count, 5.
5 + 1One more than 5 is the next number you count, 6.
6 + 1One more than 6 is the next number you count, 7.
7 + 1One more than 7 is the next number you count, 8.
8 + 1One more than 8 is the next number you count, 9.
9 + 19 and 1 are a make-ten pair: together they fill a ten frame, 10.
10 + 1One more than 10 is the next number you count, 11.
11 + 1One more than 11 is the next number you count, 12.
12 + 1One more than 12 is the next number you count, 13.
+ 2 13
0 + 20 adds nothing, so the answer is the other number, 2.
1 + 2Turn it around: one more than 2 is 3.
2 + 2Double 2: two pairs of shoes are 4 shoes.
3 + 2Count on 2 from 3: 4, 5.
4 + 2Count on 2 from 4: 5, 6.
5 + 2Count on 2 from 5: 6, 7.
6 + 2Count on 2 from 6: 7, 8.
7 + 2Count on 2 from 7: 8, 9.
8 + 28 and 2 are a make-ten pair: together they fill a ten frame, 10.
9 + 2Count on 2 from 9: 10, 11.
10 + 2Count on 2 from 10: 11, 12.
11 + 2Count on 2 from 11: 12, 13.
12 + 2Count on 2 from 12: 13, 14.
+ 3 13
0 + 30 adds nothing, so the answer is the other number, 3.
1 + 3Turn it around: one more than 3 is 4.
2 + 3Start at the bigger number, 3, and count on 2: 4, 5.
3 + 3Double 3: an insect has 3 legs on each side, 6 in all.
4 + 3Near double: 3 + 3 = 6, and 1 more makes 7.
5 + 3Two apart: double the number in between, 4 + 4 = 8.
6 + 3Count on 3 from 6: 7, 8, 9.
7 + 37 and 3 are a make-ten pair: together they fill a ten frame, 10.
8 + 3Make ten: 8 + 2 = 10, then 1 more makes 11.
9 + 3Make ten: 9 + 1 = 10, then 2 more makes 12.
10 + 31 ten and 3 ones make 13.
11 + 3Split 11 into 10 and 1: 3 + 10 = 13, and 1 more makes 14.
12 + 3Split 12 into 10 and 2: 3 + 10 = 13, and 2 more makes 15.
+ 4 13
0 + 40 adds nothing, so the answer is the other number, 4.
1 + 4Turn it around: one more than 4 is 5.
2 + 4Start at the bigger number, 4, and count on 2: 5, 6.
3 + 4Near double: 3 + 3 = 6, and 1 more makes 7.
4 + 4Double 4: a spider has 4 legs on each side, 8 in all.
5 + 4Near double: 4 + 4 = 8, and 1 more makes 9.
6 + 46 and 4 are a make-ten pair: together they fill a ten frame, 10.
7 + 4Make ten: 7 + 3 = 10, then 1 more makes 11.
8 + 4Make ten: 8 + 2 = 10, then 2 more makes 12.
9 + 4Make ten: 9 + 1 = 10, then 3 more makes 13.
10 + 41 ten and 4 ones make 14.
11 + 4Split 11 into 10 and 1: 4 + 10 = 14, and 1 more makes 15.
12 + 4Split 12 into 10 and 2: 4 + 10 = 14, and 2 more makes 16.
+ 5 13
0 + 50 adds nothing, so the answer is the other number, 5.
1 + 5Turn it around: one more than 5 is 6.
2 + 5Start at the bigger number, 5, and count on 2: 6, 7.
3 + 5Two apart: double the number in between, 4 + 4 = 8.
4 + 5Near double: 4 + 4 = 8, and 1 more makes 9.
5 + 5Double 5: the fingers on two hands, 10.
6 + 5Near double: 5 + 5 = 10, and 1 more makes 11.
7 + 5Two apart: double the number in between, 6 + 6 = 12.
8 + 5Make ten: 8 + 2 = 10, then 3 more makes 13.
9 + 5Make ten: 9 + 1 = 10, then 4 more makes 14.
10 + 51 ten and 5 ones make 15.
11 + 5Split 11 into 10 and 1: 5 + 10 = 15, and 1 more makes 16.
12 + 5Split 12 into 10 and 2: 5 + 10 = 15, and 2 more makes 17.
+ 6 13
0 + 60 adds nothing, so the answer is the other number, 6.
1 + 6Turn it around: one more than 6 is 7.
2 + 6Start at the bigger number, 6, and count on 2: 7, 8.
3 + 6Start at the bigger number, 6, and count on 3: 7, 8, 9.
4 + 64 and 6 are a make-ten pair: together they fill a ten frame, 10.
5 + 6Near double: 5 + 5 = 10, and 1 more makes 11.
6 + 6Double 6: two rows of 6 eggs fill a carton of 12.
7 + 6Near double: 6 + 6 = 12, and 1 more makes 13.
8 + 6Make ten: 8 + 2 = 10, then 4 more makes 14.
9 + 6Make ten: 9 + 1 = 10, then 5 more makes 15.
10 + 61 ten and 6 ones make 16.
11 + 6Split 11 into 10 and 1: 6 + 10 = 16, and 1 more makes 17.
12 + 6Split 12 into 10 and 2: 6 + 10 = 16, and 2 more makes 18.
+ 7 13
0 + 70 adds nothing, so the answer is the other number, 7.
1 + 7Turn it around: one more than 7 is 8.
2 + 7Start at the bigger number, 7, and count on 2: 8, 9.
3 + 73 and 7 are a make-ten pair: together they fill a ten frame, 10.
4 + 7Start with the 7: 7 + 3 = 10, then 1 more makes 11.
5 + 7Two apart: double the number in between, 6 + 6 = 12.
6 + 7Near double: 6 + 6 = 12, and 1 more makes 13.
7 + 7Double 7: two weeks of 7 days are 14 days.
8 + 7Near double: 7 + 7 = 14, and 1 more makes 15.
9 + 7Make ten: 9 + 1 = 10, then 6 more makes 16.
10 + 71 ten and 7 ones make 17.
11 + 7Split 11 into 10 and 1: 7 + 10 = 17, and 1 more makes 18.
12 + 7Split 12 into 10 and 2: 7 + 10 = 17, and 2 more makes 19.
+ 8 13
0 + 80 adds nothing, so the answer is the other number, 8.
1 + 8Turn it around: one more than 8 is 9.
2 + 82 and 8 are a make-ten pair: together they fill a ten frame, 10.
3 + 8Start with the 8: 8 + 2 = 10, then 1 more makes 11.
4 + 8Start with the 8: 8 + 2 = 10, then 2 more makes 12.
5 + 8Start with the 8: 8 + 2 = 10, then 3 more makes 13.
6 + 8Start with the 8: 8 + 2 = 10, then 4 more makes 14.
7 + 8Near double: 7 + 7 = 14, and 1 more makes 15.
8 + 8Double 8: 8 + 2 = 10, then 6 more makes 16.
9 + 8Near double: 8 + 8 = 16, and 1 more makes 17.
10 + 81 ten and 8 ones make 18.
11 + 8Split 11 into 10 and 1: 8 + 10 = 18, and 1 more makes 19.
12 + 8Make ten first: 8 + 2 = 10, then 10 more makes 20.
+ 9 13
0 + 90 adds nothing, so the answer is the other number, 9.
1 + 91 and 9 are a make-ten pair: together they fill a ten frame, 10.
2 + 9Start at the bigger number, 9, and count on 2: 10, 11.
3 + 9Start with the 9: 9 + 1 = 10, then 2 more makes 12.
4 + 9Start with the 9: 9 + 1 = 10, then 3 more makes 13.
5 + 9Start with the 9: 9 + 1 = 10, then 4 more makes 14.
6 + 9Start with the 9: 9 + 1 = 10, then 5 more makes 15.
7 + 9Start with the 9: 9 + 1 = 10, then 6 more makes 16.
8 + 9Near double: 8 + 8 = 16, and 1 more makes 17.
9 + 9Double 9: 2 less than 10 + 10, which makes 18.
10 + 91 ten and 9 ones make 19.
11 + 9Make ten first: 9 + 1 = 10, then 10 more makes 20.
12 + 9Split 12 into 10 and 2: 9 + 10 = 19, and 2 more makes 21.
+ 10 13
0 + 100 adds nothing, so the answer is the other number, 10.
1 + 10Turn it around: one more than 10 is 11.
2 + 10Start at the bigger number, 10, and count on 2: 11, 12.
3 + 103 ones and 1 ten make 13.
4 + 104 ones and 1 ten make 14.
5 + 105 ones and 1 ten make 15.
6 + 106 ones and 1 ten make 16.
7 + 107 ones and 1 ten make 17.
8 + 108 ones and 1 ten make 18.
9 + 109 ones and 1 ten make 19.
10 + 10Double 10: ten fingers and ten toes, 20.
11 + 1010 more than 11: the tens digit goes up by 1, to 21.
12 + 1010 more than 12: the tens digit goes up by 1, to 22.
+ 11 13
0 + 110 adds nothing, so the answer is the other number, 11.
1 + 11Turn it around: one more than 11 is 12.
2 + 11Start at the bigger number, 11, and count on 2: 12, 13.
3 + 11Split 11 into 10 and 1: 3 + 10 = 13, and 1 more makes 14.
4 + 11Split 11 into 10 and 1: 4 + 10 = 14, and 1 more makes 15.
5 + 11Split 11 into 10 and 1: 5 + 10 = 15, and 1 more makes 16.
6 + 11Split 11 into 10 and 1: 6 + 10 = 16, and 1 more makes 17.
7 + 11Split 11 into 10 and 1: 7 + 10 = 17, and 1 more makes 18.
8 + 11Split 11 into 10 and 1: 8 + 10 = 18, and 1 more makes 19.
9 + 11Make ten first: 9 + 1 = 10, then 10 more makes 20.
10 + 1110 more than 11: the tens digit goes up by 1, to 21.
11 + 11Double 11: double 10 is 20, double 1 is 2, together 22.
12 + 11Split 12 into 10 and 2: 11 + 10 = 21, and 2 more makes 23.
+ 12 13
0 + 120 adds nothing, so the answer is the other number, 12.
1 + 12Turn it around: one more than 12 is 13.
2 + 12Start at the bigger number, 12, and count on 2: 13, 14.
3 + 12Split 12 into 10 and 2: 3 + 10 = 13, and 2 more makes 15.
4 + 12Split 12 into 10 and 2: 4 + 10 = 14, and 2 more makes 16.
5 + 12Split 12 into 10 and 2: 5 + 10 = 15, and 2 more makes 17.
6 + 12Split 12 into 10 and 2: 6 + 10 = 16, and 2 more makes 18.
7 + 12Split 12 into 10 and 2: 7 + 10 = 17, and 2 more makes 19.
8 + 12Make ten first: 8 + 2 = 10, then 10 more makes 20.
9 + 12Split 12 into 10 and 2: 9 + 10 = 19, and 2 more makes 21.
10 + 1210 more than 12: the tens digit goes up by 1, to 22.
11 + 12Split 12 into 10 and 2: 11 + 10 = 21, and 2 more makes 23.
12 + 12Double 12: a clock face of 12 hours, twice a day, 24.
How this list was compiled: Own work. The deck is every ordered pair of addends from 0 + 0 to 12 + 12, 13 x 13 = 169 cards; every sum, every line of working and the size of every set was checked by integer arithmetic on 2026-09-19: 13 cards in each + set, 21 sums to 5, 66 sums to 10, 11 make-ten pairs, 13 doubles, 12 near doubles (3 + 4 to 9 + 8, every card whose back works from a double), 36 one-digit facts that cross ten, 100 one-digit facts and 159 facts to 20. The strategies on the backs (counting on, making ten, doubles and near doubles, turning a fact around) are the ones named in Common Core standards 1.OA.3 and 1.OA.6, which work 8 + 6 as 8 + 2 + 4 and 6 + 7 as 6 + 6 + 1; K.OA.5 asks for fluency within 5, 1.OA.6 for fluency within 10, and 2.OA.2 for all sums of two one-digit numbers from memory by the end of Grade 2. Read in the standards document hosted by CCSSO, https://learning.ccsso.org/wp-content/uploads/2022/11/Math_Standards1.pdf, checked 2026-09-19. That adding zero changes nothing, that a + b = b + a cuts the 100 one-digit facts to 55, and the list of doubles, near doubles and making ten as fact strategies were checked against Wikipedia, Addition, https://en.wikipedia.org/wiki/Addition, checked 2026-09-19. The everyday anchors on the doubles cards are fixed quantities: 6 legs on an insect and 8 on a spider, 7 days in a week, 12 eggs in a standard carton, 12 hours on a clock face and 24 in a day. Licence: own work
How it works
Addition flash cards, printable 12 to a sheet: all 169 facts from 0 + 0 to 12 + 12. The front shows a fact such as 8 + 7; the back gives 15 and a way to reach it. Flip on screen, type sums, or print one set.
Read the full guide
Pick one of 21 sets
+ 0 to + 12 hold 13 cards each: + 7 runs from 0 + 7 to 12 + 7. Sums to 5 has 21 cards, Sums to 10 66, and Make ten the 11 pairs from 0 + 10 to 10 + 0. Doubles has 13 and Near doubles 12, from 3 + 4 to 9 + 8. Cross ten keeps the 36 one-digit facts that pass ten.
Print addition flash cards one set at a time
Choose a set, turn a card and press Print cards, then print double-sided, flipped on the long edge, and 15 lands behind 8 + 7. Make ten and Near doubles fit 1 sheet each, Sums to 10 takes 6 and all 169 take 15. For a free printable addition flash cards PDF, choose Save as PDF in the print dialog.
A + set has 13 cards, so 12 + 7 prints alone on a second sheet. To stop at 11 + 7, print pages 1 and 2 only.
Addition gives the same sum in either order, so the 3 + 9 card says start with the 9. The turn-around worksheets practice that alone.
For + and − shuffled together, the subtraction flash cards have a set that mixes both within 10.
Questions and answers
Which addition facts should a child know in each grade?
The Common Core asks for fluency within 5 in kindergarten, within 10 in grade 1, and all sums of two one-digit numbers from memory by the end of grade 2: Sums to 5, Sums to 10, then 100 one-digit facts. Our reading, not an alignment.
How many addition facts are there to learn?
From 0 + 0 to 9 + 9 there are 100 one-digit facts. Because 4 + 9 and 9 + 4 share a sum, only 55 are different, and 10 of those just add zero. These flashcards for addition run on to 12 + 12, which makes 169.
Are the addition flashcards printable with answers on the back?
Yes. Each back prints the sum large with its working small underneath. The page opens in flip mode, so a young child can answer aloud without typing. Choose Missed before Print cards to reprint only the facts a child missed.