20
+
13
=
____________________
____________________
____________________
53
-
22
=
____________________
____________________
____________________
50
+
18
=
____________________
____________________
____________________
77
-
48
=
____________________
46
+
20
=
____________________
____________________
____________________
43
-
23
=
____________________
10
+
50
=
____________________
4
-
1
=
____________________
11
+
11
=
____________________
55
-
15
=
____________________
