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