13 + 13 =
26
11 + 11 =
22
9 + 9 =
18
5 + 5 =
10
30 + 30 =
60
6 + 6 =
12
22 + 22 =
44
60 + 60 =
120
12 + 12 =
24
4 + 4 =
8
8 + 8 =
16
40 + 40 =
80
50 + 50 =
100
19 + 19 =
38
25 + 25 =
50
100 + 100 =
200
10 + 10 =
20
80 + 80 =
160
2 + 2 =
4
20 + 20 =
40
250 + 250 =
500
70 + 70 =
140
16 + 16 =
32
3 + 3 =
6
200 + 200 =
400
15 + 15 =
30
17 + 17 =
34
300 + 300 =
600
500 + 500 =
1000
14 + 14 =
28
18 + 18 =
36