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