Erbijsommen en erafsommen tot 50
In de mix
1.
10
5
+
=
2.
30
20
–
=
3.
15
0
+
=
4.
15
5
+
=
5.
50
40
–
=
6.
35
15
–
=
7.
40
25
–
=
8.
20
15
–
=
9.
35
20
–
=
10.
20
15
–
=
11.
25
20
–
=
12.
20
15
–
=
13.
20
15
+
=
14.
50
20
–
=
15.
25
20
–
=
16.
20
15
–
=
17.
20
15
+
=
18.
40
25
–
=
19.
30
25
–
=
20.
35
15
–
=
21.
35
25
–
=
22.
10
5
+
=
23.
35
20
–
=
24.
15
5
+
=