Erbijsommen en erafsommen tot 100
In de mix
1.
30
10
+
=
2.
70
30
–
=
3.
70
60
–
=
4.
40
10
+
=
5.
30
20
+
=
6.
30
20
+
=
7.
70
20
–
=
8.
70
50
–
=
9.
20
30
+
=
10.
30
20
–
=
11.
10
10
+
=
12.
40
30
–
=
13.
70
10
+
=
14.
20
20
+
=
15.
60
30
–
=
16.
20
40
+
=
17.
20
10
+
=
18.
20
20
+
=
19.
20
20
+
=
20.
10
10
+
=
21.
70
30
–
=
22.
70
20
–
=
23.
20
30
+
=
24.
20
10
+
=