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