addition problems

4:27

3:59

2:33

1:10

4:03

11:20

1:46

8:30

15:37

4:56

3:56

7:48

3:48

3:38

4:19

4:02

4:23

59:22

12:47

12:02

1:48

8:51

1:41

7:14

2:42

2:02

17:53

1:03

8:31

8:55

3:04

7:20

5:41

4:15

2:41

2:19

5:34

3:36

5:46

10:10

2:24

6:46

1:07

12:59

9:22

3:41

8:18

1:11

3:57

2:01

1:46

2:30

24:37

7:06

6:02

1:15

2:26

3:36

9:33

11:04