estimating addition problems

1:12

9:11

14:28

10:15

19:58

19:13

11:25

4:29

4:44

14:28

9:10

9:11

14:28

9:58

9:55

13:34

11:59

5:13

کوتاه

45:17

13:34

1:27

1:11

10:41

10:42

کوتاه

کوتاه

37:18

4:09

12:30

3:05

22:35

21:38

24:18

23:48

21:34

21:44

21:04

25:13

23:48