Snelle erbijsommen en erafsommen tot 20
In de mix
1.
7
4
–
=
2.
8
0
–
=
3.
26
20
–
=
4.
23
11
–
=
5.
10
20
+
=
6.
40
10
+
=
7.
10
9
+
=
8.
27
21
–
=
9.
12
3
–
=
10.
25
11
+
=
11.
22
12
–
=
12.
28
6
–
=
13.
18
6
–
=
14.
48
43
–
=
15.
50
0
+
=
16.
50
8
–
=
17.
14
31
+
=
18.
18
11
–
=
19.
47
42
–
=
20.
38
17
–
=
21.
39
24
–
=
22.
28
27
–
=
23.
19
17
+
=
24.
45
0
+
=