Addition: 6's

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

6+15

21

6+16

22

6+17

23

6+18

24

6+19

25

6+20

26