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