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