2 digit addition with regrouping

3:20

3:56

7:59

5:41

15:37

6:26

3:47

7:32

5:27

3:25

2:24

4:35

6:45

8:51

9:54

12:44

1:10

3:38

10:10

4:04

10:55

00:16

6:50

1:32

18:35

3:10

2:45

5:01

9:59

3:31

1:12

3:51

5:51

5:36

5:17

11:42

7:09

3:40

8:13

00:59

9:31

13:44

11:20

5:26

8:19

3:04

2:00

5:49

3:15

3:15

6:26

7:32

9:54

3:36

6:07

2:33

4:07

2:24

5:49

6:03