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