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