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