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