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