Addieren und Subtrahieren von zweistelligen Zahlen

Die Zeit läuft 00:00

37
+
34
=
11
-
11
=
23
-
20
=
83
-
60
=
39
+
52
=
42
+
19
=
49
+
3
=
76
-
49
=
42
-
20
=
98
+
1
=
33
+
9
=
44
-
40
=
82
+
6
=
38
+
26
=
96
+
1
=
31
+
36
=
91
-
22
=
20
-
20
=
74
-
56
=
64
+
0
=
neu starten  
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