Erbijsommen en erafsommen tot 50
In de mix
1.
15
10
+
=
2.
15
5
+
=
3.
20
15
–
=
4.
15
10
+
=
5.
15
10
+
=
6.
35
20
–
=
7.
35
30
–
=
8.
20
15
–
=
9.
50
35
–
=
10.
35
15
+
=
11.
20
25
+
=
12.
15
5
+
=
13.
35
20
–
=
14.
20
15
–
=
15.
15
30
+
=
16.
15
5
+
=
17.
35
30
–
=
18.
45
40
–
=
19.
15
30
+
=
20.
20
20
+
=
21.
25
10
+
=
22.
40
25
–
=
23.
35
15
+
=
24.
25
15
–
=