Erbijsommen en erafsommen tot 100
In de mix
1.
60
40
+
=
2.
20
10
+
=
3.
40
20
–
=
4.
80
10
+
=
5.
20
0
+
=
6.
20
30
+
=
7.
50
40
+
=
8.
40
30
–
=
9.
70
30
–
=
10.
40
20
–
=
11.
70
30
–
=
12.
20
30
+
=
13.
70
20
+
=
14.
40
10
+
=
15.
40
20
–
=
16.
30
10
+
=
17.
50
40
–
=
18.
100
50
–
=
19.
50
40
–
=
20.
80
30
–
=
21.
90
20
–
=
22.
80
60
–
=
23.
70
40
–
=
24.
40
20
–
=