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