Erbijsommen en erafsommen tot 50
In de mix
1.
35
5
+
=
2.
45
35
–
=
3.
20
5
+
=
4.
40
35
–
=
5.
35
15
+
=
6.
30
5
+
=
7.
30
15
+
=
8.
15
15
+
=
9.
25
20
–
=
10.
25
15
–
=
11.
50
25
–
=
12.
50
25
–
=
13.
25
20
–
=
14.
15
0
+
=
15.
20
20
+
=
16.
30
20
–
=
17.
35
10
+
=
18.
20
15
–
=
19.
30
20
+
=
20.
40
5
+
=
21.
20
15
–
=
22.
20
10
+
=
23.
20
15
–
=
24.
45
20
–
=