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