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