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