Erbijsommen en erafsommen tot 50
In de mix
1.
15
10
+
=
2.
30
5
+
=
3.
15
5
+
=
4.
45
25
–
=
5.
15
0
+
=
6.
20
25
+
=
7.
15
25
+
=
8.
45
30
–
=
9.
20
15
–
=
10.
45
40
–
=
11.
15
25
+
=
12.
25
20
+
=
13.
40
20
–
=
14.
15
15
+
=
15.
15
5
+
=
16.
25
5
+
=
17.
30
15
+
=
18.
25
10
+
=
19.
50
15
–
=
20.
20
15
–
=
21.
15
35
+
=
22.
25
20
–
=
23.
20
15
–
=
24.
35
5
+
=