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