Klapptest: Brüche addieren

1)
4
7
+
3
4
=
16
28
+
21
28
=
37
28
2)
4
3
+
9
11
=
44
33
+
27
33
=
71
33
3)
4
5
+
1
5
=
4
5
+
1
5
= 1
4)
1
3
+
8
9
=
3
9
+
8
9
=
11
9
5)
1
4
+
4
5
=
5
20
+
16
20
=
21
20
6)
3
8
+
9
13
=
39
104
+
72
104
=
111
104
7)
1
3
+
9
7
=
7
21
+
27
21
=
34
21
8)
4
3
+
2
3
=
4
3
+
2
3
= 2
9)
1
2
+
3
2
=
1
2
+
3
2
= 2
10)
3
4
+
7
12
=
9
12
+
7
12
=
4
3
11)
1
5
+
7
9
=
9
45
+
35
45
=
44
45
12)
1
3
+
3
2
=
2
6
+
9
6
=
11
6
13)
6
11
+
2
15
=
90
165
+
22
165
=
112
165
14)
1
4
+
5
2
=
1
4
+
10
4
=
11
4
15)
3
7
+
5
11
=
33
77
+
35
77
=
68
77
16)
5
6
+
1
3
=
5
6
+
2
6
=
7
6
17)
8
5
+
3
4
=
32
20
+
15
20
=
47
20
18)
5
9
+
2
5
=
25
45
+
18
45
=
43
45