Klapptest: Brüche addieren

1)
2
3
+
4
13
=
26
39
+
12
39
=
38
39
2)
4
5
+
7
9
=
36
45
+
35
45
=
71
45
3)
5
11
+
3
2
=
10
22
+
33
22
=
43
22
4)
1
8
+
1
2
=
1
8
+
4
8
=
5
8
5)
2
11
+
1
6
=
12
66
+
11
66
=
23
66
6)
4
11
+
9
13
=
52
143
+
99
143
=
151
143
7)
4
3
+
3
7
=
28
21
+
9
21
=
37
21
8)
5
3
+
5
4
=
20
12
+
15
12
=
35
12
9)
4
3
+
4
3
=
4
3
+
4
3
=
8
3
10)
1
3
+
2
5
=
5
15
+
6
15
=
11
15
11)
3
4
+
2
15
=
45
60
+
8
60
=
53
60
12)
9
4
+
2
7
=
63
28
+
8
28
=
71
28
13)
5
8
+
1
8
=
5
8
+
1
8
=
3
4
14)
5
6
+
7
10
=
25
30
+
21
30
=
23
15
15)
2
5
+
1
2
=
4
10
+
5
10
=
9
10
16)
1
2
+
2
5
=
5
10
+
4
10
=
9
10
17)
2
3
+
3
2
=
4
6
+
9
6
=
13
6
18)
7
3
+
2
3
=
7
3
+
2
3
= 3