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