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