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