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