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