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