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