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