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