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