Addieren und Subtrahieren von zweistelligen Zahlen

Die Zeit läuft 00:00

81
-
36
=
34
-
11
=
11
-
10
=
84
+
15
=
97
-
26
=
93
+
1
=
49
-
34
=
81
-
13
=
89
+
11
=
84
+
4
=
13
-
12
=
54
+
3
=
50
-
39
=
20
+
27
=
73
+
16
=
91
+
3
=
83
-
54
=
39
-
37
=
87
-
14
=
23
-
19
=
neu starten  
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