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