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