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