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