DOUBLE FACTS

Double Facts are additions in which a number is added to itself.

For example, 1 + 1, 2 + 2 etc. 

Internalizing double facts are helpful building blocks in developing fluency in adding single digit numbers.

Double Facts within 10

0 + 0 = 0

1 + 1 =  2

2 + 2 = 4

3 + 3 = 6

4 + 4 = 8

5 + 5 = 10

6 + 6 = 12

7 + 7 = 14

8 + 8 = 16

9 + 9 = 18

10 + 10 = 20

Double Facts within 20

11 + 11 = 22

12 + 12 = 24

13 + 13 = 26

14 + 14 = 28

15 + 15 = 30

16 + 16 = 32

17 + 17 = 34

18 + 18 = 36

19 + 19 = 38

20 + 20 = 40

Doubles and Doubles Plus One

0 + 0 = 0

1 + 1 = 2

2 + 2 = 4

3 + 3 = 6

4 + 4 = 8 

5 + 5 = 10

6 + 6 = 12

7 + 7 = 14

8 + 8 = 16

9 + 9 = 18

10 + 10 = 20

11 + 11 = 22

12 + 12 = 24

13 + 13 = 26

14 + 14 = 28

15 + 15 = 30

16 + 16 = 32

17 + 17 = 34

18 + 18 = 36

19 + 19 = 38

20 + 20 = 40

0 + 1 = 1

2 + 1 = 3

4 + 1 = 5

5 + 1 = 6

8 + 1 = 9

10 + 1 = 11

12 + 1 = 13

14 + 1 = 15

16 + 1 = 17

18 + 1 = 19

20 + 1 = 21

22 + 1 = 23

24 + 1 = 25

26 + 1 = 27

28 + 1 = 29

30 + 1 = 31

32 + 1 = 33

34 + 1 = 35

36 + 1 = 37

38 + 1 = 39

40 + 1 = 41

Doubles and Near Doubles

0 + 1 = 1

1 + 2 = 3

2 + 3 = 5

3 + 4 = 7

4 + 5 = 9

5 + 6 = 11

6 + 7 = 13

7 + 8 = 15

8 + 9 = 17

9 + 10 = 19

10 + 11 = 21

11 + 12 = 23

12 + 13 = 25

13 + 14 = 27

14 + 15 = 29

15 + 16 = 31

16 + 17 = 33

17 + 18 = 35

18 + 19 = 37

19 + 20 = 39

20 + 21 = 41

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